Monster Mash Brownies
Halloween baking should be fun, colorful, and just a little bit spooky. These Monster Mash Brownies check every box with a rich chocolate brownie base covered in colorful frosting, candy eyes, Halloween M&Ms, crushed chocolate cookies, and fun gummy candies.
The best part is that you do not need complicated decorating skills to make them look impressive. Once the brownies have cooled, simply add a thin layer of colorful frosting or melted candy melts and let your creativity take over. A handful of candy eyes instantly turns the brownies into silly little monsters, while M&Ms, crushed cookies, candy corn, and gummy worms add plenty of color and texture.
This recipe is especially perfect for baking with children. Kids can help sprinkle the toppings, choose where the candy eyes go, and create their own funny monster designs. Since every brownie can look different, there is no pressure to make them perfect.
The brownie base starts with a convenient boxed mix, but you can easily use your favorite homemade brownie recipe instead. Either way, the result is a fudgy, chocolatey Halloween dessert that is ideal for parties, family gatherings, movie nights, or a fun October baking afternoon.
Why You’ll Love These Monster Mash Brownies
Easy to Make
The recipe begins with a boxed brownie mix, making the preparation quick and straightforward. Most of the fun happens during the decorating stage.
Colorful and Festive
Purple, green, and orange frosting or candy melts create a classic Halloween color palette. Add colorful candy and candy eyes, and you have an instant Halloween centerpiece.
Perfect for Kids
Children can help decorate the brownies by adding candy eyes, M&Ms, crushed cookies, candy corn, and gummy worms.
Easy to Customize
There is no single correct way to decorate these brownies. Make them cute, creepy, silly, or completely chaotic.
Great for Parties
The brownies can be cut into individual squares and arranged on a large platter, making them easy for guests to grab and enjoy.
Recipe Details
| Detail | Information |
|---|---|
| Prep Time | 15 minutes |
| Cook Time | 30 minutes |
| Total Time | 45 minutes |
| Pan Size | 9×13-inch |
| Difficulty | Easy |
| Best For | Halloween parties, family baking, kids’ activities |
Ingredients
Brownie Mix
Use 1 box of brownie mix, along with the eggs, oil, and water required according to the package directions.
A boxed mix makes this recipe especially convenient, but you can substitute your favorite homemade brownies if you prefer.
Candy Eyes
You will need ½ cup of candy eyes.
Candy eyes are the easiest way to transform ordinary brownies into little monsters. Use different sizes if available for an even more playful appearance.
Halloween M&Ms or Candy-Coated Chocolates
Add ½ cup of Halloween M&Ms or other candy-coated chocolates.
Choose seasonal colors when available, or use colors that match your chosen frosting.
Crushed Oreos
Use ½ cup crushed Oreos, if desired.
These chocolate cookie crumbs create a spooky “dirt” effect and add another layer of chocolate flavor and texture.
Candy Corn or Gummy Worms
Use ¼ cup of candy corn or gummy worms.
You can choose one or use both for a more colorful Halloween design.
Colored Frosting or Candy Melts
Use purple, green, or orange frosting or candy melts.
These colors work especially well for Halloween and create the base layer for your decorations.
How to Make Monster Mash Brownies
Step 1: Prepare the Brownie Batter
Begin by preparing the brownie mix according to the instructions on the package.
Add the required eggs, oil, and water and mix until the batter is evenly combined.
Avoid overmixing. Once the ingredients are incorporated and there are no large streaks of dry mix remaining, the batter is ready.
Prepare a 9×13-inch baking dish by greasing it or lining it with parchment paper.
Pour the brownie batter into the prepared dish and spread it evenly.
Make sure the batter reaches the corners so the finished brownies have an even thickness.
Step 2: Bake the Brownies
Bake the brownies according to the package directions.
The brownies should be set around the edges while remaining fudgy in the center.
For an especially gooey result, you can slightly underbake them, as long as they are properly cooked and set enough to handle.
Once baked, remove the pan from the oven and allow the brownies to cool completely.
Do not rush the cooling stage. Warm brownies can make frosting or melted candy melts too soft and can cause the decorations to slide.
Step 3: Prepare the Decorating Ingredients
While the brownies are cooling, prepare all of your toppings.
Place the candy eyes, Halloween M&Ms, crushed Oreos, candy corn, and gummy worms in separate small bowls.
If you are using candy melts, melt them according to their package directions.
If you are using frosting, have it ready to spread.
Preparing everything before you start decorating makes the process faster and allows you to add the toppings while the frosting or candy melts are still soft.
Step 4: Add the Colorful Base
Once the brownies have cooled completely, spread a thin layer of colored frosting or melted candy melts over the top.
You can cover the entire surface with one color or use multiple colors.
For example, you could spread green frosting over one section, purple over another, and orange over a third section.
Alternatively, use one color as the main base and add small decorative patches of another color.
The layer does not have to be perfectly smooth. A slightly textured surface can make the finished brownies look more playful.
Step 5: Add the Monster Decorations
Now it is time for the fun part.
Sprinkle the Halloween M&Ms across the frosting.
Add some crushed Oreos to create spooky patches of “dirt.”
Scatter candy corn or gummy worms around the surface.
While the frosting or candy melts are still soft, gently press the toppings into place so they stick.
Step 6: Add the Candy Eyes
Place the candy eyes throughout the brownie surface.
You can place two eyes together to make traditional little monster faces, or use several eyes on one brownie for a fun multi-eyed monster effect.
Try different arrangements.
Some brownies can have two large eyes, while others can have three or four smaller eyes.
There is no need for every brownie to look the same.
Step 7: Add Gummy Worms
If you are using gummy worms, gently press them into the frosting.
You can leave part of each worm visible so it looks like it is crawling out of the brownie surface.
This adds another fun element to the finished dessert and works particularly well for a Halloween party.
Step 8: Slice and Serve
Once the decorations are in place, allow the frosting or candy melts to set.
Cut the brownies into squares.
Use a sharp knife and wipe the blade between cuts if necessary to keep the pieces neat.
Arrange the brownies on a festive platter and serve.
Tips for the Best Monster Mash Brownies
Let the Brownies Cool Completely
Decorating while the brownies are warm can cause the frosting to soften and the toppings to move.
Cool brownies provide a much more stable surface.
Slightly Underbake for a Gooey Center
If you love very fudgy brownies, slightly underbaking them can create a softer center.
However, make sure they are properly baked and set before decorating.
Prepare the Decorations First
Have all the toppings ready before spreading the frosting.
Once the frosting or melted candy melts are on the brownies, you want to add the decorations while the surface is still soft enough for them to stick.
Do Not Overload Every Brownie
It can be tempting to add every candy to every piece, but a little variety can make the finished platter more visually interesting.
Some brownies can feature candy eyes and M&Ms, while others can have gummy worms or cookie crumbs.
Use Different Eye Sizes
If you can find candy eyes in different sizes, combine them.
Large and small eyes create funny monster faces without requiring additional decorating work.
Homemade Brownie Option
Although boxed brownie mix keeps this recipe quick and easy, homemade brownies can also be used.
Choose a brownie recipe with a rich, fudgy texture and bake it in a 9×13-inch pan.
Allow the brownies to cool completely before decorating.
The toppings are the main feature of the Monster Mash design, so you can use your favorite brownie base underneath them.
Fun Monster Design Ideas
One of the best things about these brownies is that you can create different monster personalities.
One-Eyed Monsters
Place one large candy eye in the center of a brownie for a simple cyclops design.
Multi-Eyed Monsters
Use three or more candy eyes to create strange little creatures.
Colorful Monsters
Use different frosting colors for different brownies. Purple, green, and orange create a classic Halloween combination.
Dirt Monsters
Cover sections with crushed Oreos and add a few candy eyes so it looks like a monster is hiding in the “dirt.”
Gummy Worm Monsters
Use gummy worms as part of the decoration and add candy eyes nearby for a playful creepy-crawly effect.
How to Make These Brownies Ahead
If you are preparing for a Halloween party, you can bake the brownies ahead of time.
Bake them according to the recipe and allow them to cool completely.
Store the undecorated brownies covered until you are ready to assemble the dessert.
When it is time to decorate, prepare the frosting and toppings and finish the brownies shortly before serving.
You can also decorate them ahead of time and store them in an airtight container.
How to Store Monster Mash Brownies
Store leftover brownies in an airtight container for up to 3 days.
Keep them protected from heat and moisture so the frosting and candy decorations remain in good condition.
If you are stacking the brownies, parchment paper between layers can help prevent some of the decorations from sticking.
For the best presentation, a single layer is preferable.
Serving Ideas
Halloween Dessert Table
Place the brownies on a large Halloween-themed platter and arrange the different monster designs together.
Kids’ Halloween Party
Let children decorate their own brownie sections with different candies.
Halloween Movie Night
Serve these brownies alongside other snacks for a fun seasonal movie night.
Family Baking Afternoon
Prepare the brownies together and let everyone create their own monster designs.
Frequently Asked Questions
Can I use homemade brownies?
Yes. Homemade brownies can replace the boxed mix. Use a recipe that works well in a 9×13-inch pan.
Do I have to use Oreos?
No. The crushed cookies are optional. They are included to create a spooky dirt effect, but you can leave them out.
Can I use only frosting instead of candy melts?
Yes. Colored frosting works well as the decorating base.
What colors work best for Halloween?
Purple, green, and orange are classic Halloween colors and work especially well for this recipe.
Can I use other candies?
Yes. The recipe is flexible. You can substitute similar Halloween candies based on what you have available.
How do I stop the toppings from falling off?
Add the toppings while the frosting or melted candy melts are still soft, then gently press them into the surface.
Can children decorate the brownies?
Absolutely. This recipe is particularly well suited to children because the decorating process is simple and creative.
How long do the brownies keep?
Stored in an airtight container, the brownies can be kept for up to 3 days.
Nutrition Information
The estimated nutrition per brownie is:
| Serving Size | Calories | Protein | Carbs | Fat | Fiber | Sugar |
|---|---|---|---|---|---|---|
| 1 brownie | 310 | 4g | 42g | 14g | 2g | 32g |
Nutrition disclaimer: Nutrition information is estimated and may vary depending on the brownie mix, frosting or candy melts, candies, cookies, and other ingredients used. Portion size and preparation methods can also affect the final values.
Why These Monster Mash Brownies Are Perfect for Halloween
Halloween desserts are supposed to be playful, and these brownies embrace that idea completely.
Instead of trying to create perfectly shaped decorations, the recipe encourages you to pile on colorful candies and create silly monster faces.
The dark chocolate brownie base gives you a rich foundation, while the colorful frosting creates a bright background. Candy eyes immediately add personality, and the combination of M&Ms, crushed chocolate cookies, candy corn, and gummy worms creates plenty of texture.
Every brownie can be different, which makes the finished dessert feel homemade and creative.
The recipe is also convenient because the decorating process can be done quickly once the brownies have cooled. That makes these brownies especially useful when you are preparing several dishes for a Halloween gathering.
A Fun Halloween Baking Activity
Monster Mash Brownies are more than just a dessert—they can become a Halloween activity.
Set up a decorating station with the cooled brownies and small bowls of toppings.
Give everyone access to candy eyes, M&Ms, crushed cookies, candy corn, gummy worms, and colorful frosting.
Then let everyone create their own monster.
One person might make a three-eyed green monster, while another creates a purple monster covered in M&Ms.
Because there is no single correct design, children can use their imagination without worrying about making the decorations perfect.
Once everyone is finished, arrange the brownies together on one platter.
The collection of different monster designs can become part of the Halloween table decoration.
Final Thoughts
These Monster Mash Brownies are a fun and easy way to bring plenty of Halloween spirit to your dessert table.
The combination of fudgy chocolate brownies, colorful frosting, candy eyes, Halloween M&Ms, crushed cookies, and gummy treats creates a dessert that is as entertaining to decorate as it is delicious to eat.
Whether you use a boxed brownie mix for convenience or homemade brownies for a richer homemade touch, the decorating process remains simple.
Make the monsters silly, spooky, colorful, or completely wild. Add extra eyes, pile on the candy, or keep each brownie simple.
Whether you are preparing treats for a Halloween party, baking with your children, or planning a cozy October night at home, these Monster Mash Brownies are a festive dessert that is sure to bring smiles.
Grab your favorite Halloween candies, let your creativity take over, and create a whole batch of delicious little monsters.