If you’re looking for a beautiful, comforting side dish that tastes as wonderful as it looks, this Cheesy Root Vegetable Gratin is a recipe worth adding to your menu. Made with colorful layers of sweet potatoes, parsnips, and beets, then baked with garlic, fresh thyme, heavy cream, Parmesan, and Gruyere cheese, this dish brings warmth and flavor to any dinner table.
Unlike a traditional potato gratin, this version combines several root vegetables to create a colorful striped presentation. The sweet potatoes bring natural sweetness, the parsnips add a delicate earthy flavor, and the beets contribute rich color and a distinctive taste. As the vegetables bake, they soften and absorb the seasoned cream, while the cheese creates a golden, bubbling finish.
This cheesy root vegetable casserole is ideal for Thanksgiving, Christmas, holiday gatherings, and cozy family dinners. Although it looks impressive enough for a special occasion, the preparation is straightforward and uses familiar ingredients. You simply slice the vegetables, season them separately, arrange them in a baking dish, and let the oven do most of the work.
Another advantage is that much of the preparation can be completed ahead of time. This makes the recipe especially useful when you’re preparing several dishes for a holiday meal and want to reduce the amount of work required just before serving.
Whether you serve it alongside roasted chicken, a holiday roast, or other seasonal vegetables, this Cheesy Root Vegetable Gratin is a delicious way to bring color, creamy texture, and savory flavor to your table.
Why You’ll Love This Cheesy Root Vegetable Gratin
There are plenty of reasons to make this colorful vegetable gratin for your next gathering.
- Beautiful presentation: Alternating sweet potatoes, parsnips, and beets creates attractive rows of colorful vegetables.
- Creamy and cheesy: Heavy cream, Parmesan, and Gruyere combine to create a rich, savory finish.
- Fresh herb flavor: Garlic and fresh thyme add an aromatic touch that complements the sweetness of the root vegetables.
- Perfect for holidays: This elegant side dish fits naturally into Thanksgiving and Christmas menus.
- Easy to prepare ahead: You can assemble the gratin in advance and refrigerate it before baking.
- Flexible ingredients: Try different cheeses or substitute whole milk for heavy cream if you prefer a lighter texture.
- A delicious way to enjoy vegetables: The combination of flavors and textures makes this dish an appealing alternative to ordinary vegetable sides.
Recipe Details
- Prep Time: 15 minutes
- Cook Time: 50 minutes
- Total Time: 1 hour 5 minutes, as listed in the original recipe
- Servings: 8
- Course: Side Dish
- Cuisine: American, Holiday
- Calories: Approximately 265 kcal per serving, according to the original recipe
Ingredients for Cheesy Root Vegetable Gratin
This recipe combines three root vegetables with cream, cheese, garlic, and fresh herbs. Preparing the vegetables and seasonings separately helps you arrange the layers neatly and distribute the flavors throughout the dish.
Vegetables
1. Sweet Potatoes
You’ll need 1–2 long sweet potatoes, approximately 2 inches thick, peeled.
Sweet potatoes provide a naturally sweet flavor and a soft, tender texture when baked. Their orange color also creates a beautiful contrast with the pale parsnips and deep red beets.
Choose long, relatively straight sweet potatoes if possible. They are easier to slice into consistent rounds, which helps create an attractive arrangement.
2. Parsnips
Use 3–4 large parsnips, trimmed and peeled.
Parsnips have a delicate sweetness and an earthy flavor that complements both sweet potatoes and beets. When sliced thinly and baked in cream, they become tender and absorb the flavors of the garlic, thyme, and cheese.
Choose firm parsnips without soft spots. Similar-sized pieces will make it easier to create evenly arranged rows.
3. Beets
You’ll need 3–5 small beets, peeled.
Beets contribute the deep red color that makes this gratin visually striking. Their earthy sweetness balances the other vegetables and gives the finished dish a distinctive appearance.
Keep the beets in a separate bowl while preparing the ingredients. Their natural color can stain the other vegetables, so handling them separately helps preserve the colorful striped effect.
Cream and Cheese
4. Heavy Cream
Use 14 tablespoons heavy cream, divided.
Heavy cream creates the rich, creamy base that helps the vegetables soften as they bake. It also carries the flavors of the garlic, thyme, and cheese throughout the dish.
Whole milk can be used as an alternative, but the gratin will not be as creamy or rich.
5. Grated Parmesan
You’ll need 4 ounces grated Parmesan cheese, divided.
Parmesan provides a savory, slightly nutty flavor that complements the root vegetables. Some is mixed with the vegetables, while additional Parmesan is incorporated into the bottom layer of the dish.
The original instructions reserve the Gruyere for the final topping.
6. Gruyere Cheese
Use 1 ounce shredded Gruyere.
Gruyere adds a rich cheese flavor and creates a melted, golden finish when sprinkled over the gratin before the final baking stage.
7. Fresh Thyme
You’ll need 1 tablespoon fresh minced thyme, divided, plus extra for garnish.
Thyme has an earthy, aromatic flavor that works beautifully with roasted root vegetables. Dividing it among the vegetable mixtures helps distribute its flavor throughout the gratin.
8. Garlic
Use 1 minced garlic clove.
Garlic adds savory depth to the cream and cheese, helping balance the sweetness of the vegetables.
Seasonings
- Salt, to taste
- Black pepper, to taste
- 1 tablespoon softened unsalted butter, for greasing the baking dish
Salt and pepper enhance the flavors of the vegetables, cream, and cheese. Season each vegetable mixture separately so that the flavors remain balanced throughout the dish.
Kitchen Tools You’ll Need
You don’t need specialized cooking equipment to prepare this gratin. Gather the following tools before beginning:
- Large sharp knife or mandoline slicer
- Cutting board
- Mixing bowls
- Measuring cups and spoons
- 3-quart baking dish
- Wooden spoon or spatula
- Aluminum foil
A mandoline slicer can make it easier to cut thin, even rounds. If you use one, handle it carefully and use its safety guard whenever possible.
A sharp knife also works well. The main goal is to keep the vegetable slices reasonably consistent in thickness so they cook evenly.
How to Make Cheesy Root Vegetable Gratin
Follow these steps to create tender, creamy vegetables topped with golden Gruyere cheese.
Step 1: Preheat the Oven and Prepare the Baking Dish
Preheat your oven to 400°F (approximately 204°C).
Grease a 3-quart baking dish with the softened unsalted butter, coating the bottom and sides.
Preparing the dish before arranging the vegetables helps prevent sticking and makes serving easier later.
Set the baking dish aside while you prepare the vegetable mixtures.
Step 2: Slice the Root Vegetables
Peel the sweet potatoes, parsnips, and beets.
Using a sharp knife or mandoline slicer, cut each vegetable into very thin rounds. Try to keep the slices similar in thickness so that they soften at a similar rate during baking.
Place each vegetable in its own mixing bowl.
Keeping the vegetables separate is particularly important because beets can release color onto the other ingredients. Separate bowls also make it easier to add the correct quantities of cream, Parmesan, thyme, salt, and pepper.
Step 3: Season the Sweet Potatoes
Add the following ingredients to the sweet potato bowl:
- 4 tablespoons heavy cream
- 1/2 ounce grated Parmesan
- 1 teaspoon fresh thyme
- Salt and black pepper, to taste
Toss the slices gently until they are coated with the cream, cheese, and seasonings.
Make sure the cream and thyme are distributed throughout the bowl rather than concentrated on only a few slices.
The sweet potatoes will contribute a naturally sweet, creamy layer to the finished gratin.
Step 4: Season the Parsnips
Prepare the parsnips using the same mixture as the sweet potatoes.
Add:
- 4 tablespoons heavy cream
- 1/2 ounce grated Parmesan
- 1 teaspoon fresh thyme
- Salt and black pepper, to taste
Toss gently until the slices are evenly coated.
Keeping the parsnips separate from the beets helps maintain the contrast between the pale and red vegetable layers.
Step 5: Season the Beets
Place the beet slices in their own bowl.
Add:
- 2 tablespoons heavy cream
- 1/2 ounce grated Parmesan
- 1 teaspoon fresh thyme
- Salt and black pepper, to taste
Toss gently to coat.
The original recipe recommends lightly coating the beets and avoiding excessive mixing with the other vegetables. This helps reduce color transfer and preserves the attractive striped presentation.
Step 6: Prepare the Creamy Base
Pour 1/4 cup heavy cream into the bottom of the prepared baking dish.
Add the minced garlic and 1/2 ounce grated Parmesan, distributing them across the base.
This layer provides additional flavor and moisture underneath the vegetables. As the gratin bakes, the cream combines with the vegetable juices and melted cheese to create a rich base.
Step 7: Arrange the Vegetable Layers
Begin arranging the seasoned vegetables in the baking dish.
Stand the slices upright in rows, alternating sweet potatoes, parsnips, and beets to create a colorful striped pattern.
Try to keep the rows close together while maintaining the upright arrangement. The contrasting orange, pale, and red colors create an attractive presentation that looks especially impressive when the dish is brought to the table.
Continue until the baking dish is filled with the arranged vegetables.
Step 8: Cover and Bake
Cover the baking dish tightly with aluminum foil.
Place it in the preheated oven and bake for 30 minutes, until the vegetables begin to soften.
Covering the dish helps retain moisture while the root vegetables cook. This initial baking stage allows the slices to become tender before the cheese topping is added.
Step 9: Add the Gruyere Cheese
Carefully remove the baking dish from the oven and take off the foil.
Sprinkle the 1 ounce shredded Gruyere evenly over the top of the vegetables.
Return the uncovered dish to the oven and bake for another 18–20 minutes.
The vegetables should become tender, and the cheese should melt into a golden, bubbling topping.
If the vegetables are still firm, allow additional baking time as needed rather than relying exclusively on the stated time.
Step 10: Garnish and Serve
Remove the gratin from the oven once the vegetables are tender and the cheese is golden.
Sprinkle fresh thyme over the top for a fragrant finish.
Allow the dish to rest briefly before serving. This gives the cream and melted cheese a little time to settle, making it easier to serve portions while preserving the colorful vegetable layers.
Serve warm alongside your favorite main course or as part of a holiday meal.
Pro Tips for the Best Root Vegetable Gratin
A few simple techniques can help you achieve an attractive presentation and tender, flavorful vegetables.
Slice the Vegetables Thinly and Evenly
Thin, consistent slices are important because the gratin contains several different root vegetables.
If some slices are much thicker than others, they may take longer to become tender. Aim for a consistent thickness to help the vegetables cook more evenly.
Keep the Beets Separate
Beets naturally release deep red pigment. Tossing them extensively with the other vegetables can transfer color and make the finished gratin less visually distinct.
Season the beets in their own bowl and arrange them carefully when layering the dish.
Don’t Skip the Covered Baking Stage
The first 30 minutes under foil help the vegetables begin softening while retaining moisture.
Adding the cheese after this stage allows the gratin to finish uncovered, giving the Gruyere a chance to melt and brown.
Arrange the Rows Carefully
Alternating the colors creates the striped appearance that makes this recipe special.
Take your time when placing the vegetables upright. A little care during assembly can make a significant difference in the finished presentation.
Use Fresh Thyme When Available
Fresh thyme complements the earthy flavor of the parsnips and beets while balancing the sweetness of the sweet potatoes.
Adding some thyme to each vegetable mixture ensures that its flavor is distributed throughout the dish.
Check Tenderness Before Serving
The original recipe gives a total cooking time of approximately 48–50 minutes, depending on the stage and how quickly the vegetables soften.
Test the vegetables with a fork before removing the dish from the oven. If they are still firm, continue baking until they reach the desired tenderness.
Easy Variations to Try
This Cheesy Root Vegetable Gratin can be adapted with different cheeses or small adjustments to the preparation.
Sharp Cheddar Gratin
Replace the Gruyere with sharp cheddar for a stronger, familiar cheese flavor.
Cheddar pairs well with sweet potatoes and adds a rich, savory finish. Choose a cheese that melts well and sprinkle it over the vegetables during the final baking stage.
Fontina Root Vegetable Gratin
Fontina is another option suggested in the original recipe. Its melting qualities make it suitable for a creamy, cheesy topping.
Use it in place of the Gruyere while keeping the general baking method the same.
Asiago Vegetable Gratin
Asiago provides a distinctive savory flavor and can be used as an alternative cheese.
Since different cheeses vary in saltiness and melting behavior, adjust the seasoning and monitor the topping as it bakes.
Whole Milk Version
If you don’t have heavy cream, whole milk can be used instead.
The result will be less rich and creamy than the original recipe, but it offers a useful alternative when heavy cream is unavailable.
Adjust the Herb Flavor
Fresh thyme is the main herb in this recipe. If you want to experiment, you can add a small amount of another complementary herb as a garnish.
Keep the quantity modest so the additional flavor does not overwhelm the vegetables.
What to Serve with Cheesy Root Vegetable Gratin
This creamy vegetable gratin pairs well with many main dishes, especially during fall and winter.
Roasted Chicken
Roasted chicken is a natural companion to this gratin. The savory flavor of the chicken balances the sweet potatoes and earthy beets, while the creamy vegetables add richness to the plate.
Holiday Roast
Serve the gratin with your favorite holiday roast for a comforting and colorful meal.
Its attractive layers make it a particularly good choice when you want a side dish that looks impressive on a holiday table.
Grilled Steak
The rich cream and cheese complement the savory flavor of grilled steak. Add a fresh salad or another vegetable side to balance the meal.
Roasted Vegetables
For a vegetable-focused menu, serve the gratin with additional roasted vegetables or a crisp green salad.
The contrast between the creamy gratin and fresh greens helps create a balanced plate.
Thanksgiving Dinner
This recipe works beautifully alongside traditional holiday favorites. Serve it with roasted poultry, other vegetable sides, and your preferred seasonal dishes.
Can You Make Root Vegetable Gratin Ahead of Time?
Yes. The original recipe recommends preparing the gratin up to one day ahead.
Slice and season the vegetables, arrange them in the baking dish with the cream and Parmesan base, and cover the dish before refrigerating.
Keep the assembled dish refrigerated until you’re ready to bake. Avoid leaving the cream-containing mixture at room temperature for an extended period.
When you’re ready to cook, bake the gratin according to the original method. The source recommends adding approximately 5–7 minutes to the baking time when preparing it ahead.
Because the dish may be cold when it enters the oven, check that the vegetables are tender and the center is thoroughly heated before serving. The exact time may vary depending on the temperature of the dish and the thickness of the vegetable slices.
If you want the neatest presentation, handle the beets carefully during preparation and arrange the layers just as you would when making the dish fresh.
How to Store and Reheat Leftovers
If you have leftover gratin, store it properly so you can enjoy it with another meal.
Refrigerating Leftovers
Allow the gratin to cool briefly, then transfer it to an airtight container or cover the baking dish and refrigerate promptly.
For food safety, use refrigerated leftovers within 3–4 days.
Reheating in the Oven
Place the leftover gratin in an oven-safe dish and cover it loosely with foil.
Warm it in the oven until the vegetables and creamy center are thoroughly heated. Remove the foil near the end if you want the cheese topping to regain some of its golden texture.
The exact reheating time depends on the amount being warmed.
Reheating Individual Portions
Individual portions can also be reheated in a microwave-safe container.
The vegetables should become hot throughout, although the cheese topping may not be as golden or crisp as when the gratin is freshly baked.
Freezing Considerations
The original recipe does not provide a tested freezing method or a specific freezer-storage period. Since cream and melted cheese can change texture after freezing and thawing, refrigeration is the more straightforward storage option when you plan to eat the leftovers within a few days.
Frequently Asked Questions
What Is a Root Vegetable Gratin?
A root vegetable gratin is a baked dish made with thinly sliced root vegetables arranged in a baking dish, usually with cream, seasonings, and cheese.
In this recipe, sweet potatoes, parsnips, and beets are layered with cream, garlic, Parmesan, and thyme, then finished with Gruyere cheese.
Can I Make This Gratin Without Heavy Cream?
Yes. The original recipe suggests whole milk as an alternative.
Keep in mind that whole milk will not produce the same rich, creamy texture as heavy cream.
How Do I Keep the Beets from Coloring the Other Vegetables?
Season the beets in a separate bowl and avoid mixing them extensively with the other vegetables before layering.
Careful handling helps preserve the contrast between the orange sweet potatoes, pale parsnips, and red beets.
How Do I Know When the Gratin Is Done?
The vegetables should be tender when tested with a fork, and the cheese topping should be melted, golden, and bubbling.
If the vegetables are still firm after the recommended baking time, continue cooking until they reach the desired texture.
Can I Use a Different Cheese?
Yes. The original recipe suggests sharp cheddar, Fontina, or Asiago as alternatives to Gruyere.
Each cheese has a slightly different flavor, so choose one that complements the vegetables and melts well.
Can I Prepare the Gratin a Day in Advance?
Yes. You can assemble the dish, cover it, and refrigerate it up to one day ahead.
The original recipe recommends adding approximately 5–7 minutes to the baking time. Check the vegetables for tenderness and ensure the center is thoroughly heated before serving.
Why Should I Slice the Vegetables Thinly?
Thin slices soften more readily during baking and are easier to arrange in alternating rows.
Consistent slices also help the different vegetables cook at a similar rate.
Is This Recipe Suitable for Thanksgiving?
Absolutely. Its colorful layers, creamy texture, and melted cheese topping make it a fitting side dish for Thanksgiving and other holiday gatherings.
It pairs particularly well with roasted chicken or a holiday roast.
Can I Make This Recipe Vegetarian?
The vegetables themselves are meat-free, but traditional Parmesan and some other hard cheeses may use animal-derived rennet.
If you follow a vegetarian diet, choose Parmesan-style and Gruyere cheeses made with suitable vegetarian ingredients.
Nutrition Information
The original recipe provides the following estimated nutrition information per serving.
| Nutrient | Amount |
|---|---|
| Serving size | 1 plate |
| Calories | 265 kcal |
| Protein | 9 g |
| Carbohydrates | 22 g |
| Fat | 17 g |
| Fiber | 5 g |
| Sugar | 7 g |
These figures are estimates and may vary depending on the size of the vegetables, the exact amount of cream used, and the brands of cheese.
Final Thoughts
Cheesy Root Vegetable Gratin is a beautiful, comforting side dish that combines the natural sweetness of sweet potatoes, the earthy flavor of parsnips, and the rich color of beets.
The cream, garlic, Parmesan, and fresh thyme create a flavorful base, while the Gruyere topping adds a golden, cheesy finish. Despite its elegant appearance, the recipe uses simple ingredients and straightforward preparation.
Whether you’re planning Thanksgiving dinner, preparing a holiday roast, or looking for a new vegetable side for a family meal, this colorful gratin is a wonderful option.
Prepare it ahead when needed, arrange the vegetables in alternating rows for an attractive presentation, and serve it warm for the best texture and flavor.
Save this Cheesy Root Vegetable Gratin recipe for your next special meal and enjoy a delicious combination of creamy cheese and tender seasonal vegetables.
Cheesy Root Vegetable Gratin Recipe Card
Prep Time: 15 minutes
Cook Time: 50 minutes
Total Time: 1 hour 5 minutes, as listed in the original recipe
Servings: 8
Course: Side Dish
Cuisine: American, Holiday
Calories: 265 kcal per serving, according to the original recipe
Ingredients
Vegetables
- 1 tablespoon softened unsalted butter, for greasing the baking dish
- 1–2 long sweet potatoes, approximately 2 inches thick, peeled
- 3–4 large parsnips, trimmed and peeled
- 3–5 small beets, peeled
Cream and Cheese
- 14 tablespoons heavy cream, divided
- 4 ounces grated Parmesan, divided
- 1 tablespoon fresh minced thyme, divided, plus more for garnish
- 1 garlic clove, minced
- 1 ounce shredded Gruyere
Seasonings
- Salt, to taste
- Black pepper, to taste
Instructions
- Preheat the oven to 400°F (approximately 204°C). Grease a 3-quart baking dish with softened butter.
- Slice the sweet potatoes, parsnips, and beets into very thin rounds. Place each vegetable in a separate bowl.
- Toss the sweet potatoes with 4 tablespoons cream, 1/2 ounce Parmesan, 1 teaspoon thyme, salt, and pepper.
- Toss the parsnips with 4 tablespoons cream, 1/2 ounce Parmesan, 1 teaspoon thyme, salt, and pepper.
- Toss the beets with 2 tablespoons cream, 1/2 ounce Parmesan, 1 teaspoon thyme, salt, and pepper.
- Pour 1/4 cup cream into the bottom of the prepared dish. Add the minced garlic and 1/2 ounce Parmesan.
- Arrange the vegetable slices upright in alternating rows to create a colorful striped pattern.
- Cover with aluminum foil and bake for 30 minutes, until the vegetables begin to soften.
- Remove the foil and sprinkle the shredded Gruyere over the top.
- Bake uncovered for another 18–20 minutes, until the vegetables are tender and the cheese is golden and bubbling.
- Garnish with fresh thyme and serve warm.
Notes
- Slice the vegetables evenly to encourage consistent cooking.
- Season the beets separately to help prevent their color from transferring to the other vegetables.
- Prepare the dish up to one day ahead and refrigerate it covered.
- Add approximately 5–7 minutes to the baking time if preparing ahead, and check that the center is thoroughly heated.
- Whole milk can replace heavy cream, but the gratin will be less creamy.
- Try sharp cheddar, Fontina, or Asiago instead of Gruyere.
- Refrigerate leftovers promptly and use within 3–4 days.