Monster Mash Brownies

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My kids have always loved helping me bake, especially around Halloween. There’s something about transforming simple ingredients into spooky treats that brings out their inner mad scientist. One of our all-time favorite recipes is these Monster Mash Brownies, which are not only delicious but also incredibly fun to decorate. They’re the perfect addition to any Halloween celebration, from classroom parties to spooky movie nights.

Get ready to mash with these monstrously delicious brownies!

These Monster Mash Brownies are deceptively easy to make. You can start with your favorite boxed brownie mix, which saves time and guarantees a perfect base every time. Then, the real fun begins – transforming the simple brownies into adorable monsters with colorful frosting, spooky sprinkles, and googly candy eyes. Trust me, these treats are a real crowd-pleaser, even for the pickiest of eaters.

Why You’ll Love It

These Monster Mash Brownies are more than just a delicious treat; they’re an experience! They are incredibly easy to make, perfect for busy weeknights or last-minute party preparations. The boxed brownie mix makes them foolproof, even for beginner bakers. But the best part is decorating! Kids and adults alike will love creating their own spooky monsters with colorful frosting, sprinkles, and candy eyes. And let’s not forget the taste—they’re rich, fudgy, and full of festive Halloween flavor.

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A plate of Monster Mash Brownies decorated with Halloween sprinkles and candy eyes.

Monster Mash Brownies


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Description

These spooky Monster Mash Brownies start with a boxed mix and transform into adorable Halloween treats. Kids and adults will love decorating them with colorful frosting, sprinkles, and candy eyes. A guaranteed crowd-pleaser for any Halloween gathering.


Ingredients

  • One box of your favorite brownie mix (plus the ingredients called for on the box – usually eggs, oil, and water)
  • One cup of vanilla frosting
  • Food coloring in your favorite Halloween hues (green, purple, orange, and black)
  • Halloween sprinkles
  • Candy eyes


Instructions

  1. Preheat oven and grease a square 8×8 inch baking pan. Prepare brownie mix according to package directions.
  2. Pour batter into the pan, spread evenly, and bake as directed. Let cool completely.
  3. Divide frosting into bowls and add food coloring to each.
  4. Frost the cooled brownies and decorate with sprinkles and candy eyes.
  5. Cut into squares and serve.

Notes

Underbake the brownies slightly for a fudgier texture. Avoid overmixing the batter. For richer brownies, add a tablespoon of melted dark chocolate to the batter. Ensure the brownies are completely cool before frosting to prevent melting.

  • Prep Time: 15 mins
  • Cook Time: 20-25 mins
  • Category: Dessert
  • Method: Baking
  • Cuisine: American

Ingredient Lowdown

Ingredients for Monster Mash Brownies laid out on a table.
Simple ingredients for a spooktacular treat!

Let’s gather our ghoul-friends and get ready to bake! Here’s what you’ll need for these monstrously delicious brownies:

  • One box of your favorite brownie mix (plus the ingredients called for on the box – usually eggs, oil, and water). This is our base for the spooky magic!
  • One cup of vanilla frosting. Plain vanilla works best as it allows the colors to really pop!
  • Food coloring in your favorite Halloween hues (green, purple, and orange are classics). A touch of black can add extra drama.
  • A generous helping of Halloween sprinkles. Think ghosts, bats, pumpkins – let your creativity run wild!
  • Candy eyes to bring those brownies to life (or un-life, depending on your spooky perspective). These are optional, yet strongly encouraged.

Step-by-Step Instructions

Step 1: Brownie Base

Preheat your oven according to the instructions on the brownie mix box. Grease a square 8×8 inch baking pan to prevent sticking. Prepare the brownie mix according to the package directions, usually by combining the mix with eggs, oil, and water.

Step 2: Baking the Brownies

Pour the brownie batter into the prepared pan and spread evenly. Bake as directed on the box, checking for doneness with a toothpick inserted into the center. It should come out with moist crumbs attached, not completely clean. Let the brownies cool completely in the pan before frosting.

Step 3: Frosting Fun

Divide the vanilla frosting into separate bowls, one for each color you’re using. Add a few drops of food coloring to each bowl and mix until the color is evenly distributed. You can create various shades by adjusting the amount of food coloring.

Step 4: Decorating the Monsters

Once the brownies are completely cool, frost them with the colored frosting, using a spatula or knife to spread it evenly. Now for the monstrous part! Sprinkle generously with Halloween sprinkles, making sure to cover the entire surface. Place the candy eyes strategically to create spooky faces.

Step 5: Slice and Serve

Cut the frosted brownies into squares and serve immediately. These Monster Mash Brownies are best enjoyed fresh, but can be stored in an airtight container at room temperature for up to 3 days or in the refrigerator for up to a week.

Test-Kitchen Tips

A spatula frosting a batch of Monster Mash Brownies.
Tips for perfect frosting!

For extra ooey-gooey brownies, slightly underbake them by a couple of minutes. This will create a fudgy center that’s simply irresistible. Don’t overmix the batter, as this can make the brownies tough. A few swirls are all you need. Want even richer brownies? Add a tablespoon of melted dark chocolate to the batter! When frosting the brownies, let them cool completely first to prevent the frosting from melting. For more fantastic brownie recipes, check out our other dessert options.

Switch-Ups & Swaps

Want to switch things up a bit? You can use chocolate frosting instead of vanilla and add white chocolate chips for a different flavor profile. Peanut butter lovers can swirl a few tablespoons of peanut butter into the brownie batter before baking. For a touch of autumnal spice, add a teaspoon of cinnamon to the frosting. Or, check out our Breakfast recipes for morning delights. For an even spookier twist, use black cocoa powder in the brownie mix for a darker, more dramatic look. The possibilities are endless, so feel free to experiment and create your own unique monster mash!

Can I use a different kind of brownie mix?

You can use any type of brownie mix you like, whether it’s fudgy, cakey, or even gluten-free. Just be sure to follow the baking instructions on the box for best results.

Can I customize the decorations?

Absolutely! Get creative with your frosting colors and sprinkles. You could use red and black for a spiderweb theme, or orange and white for a candy corn look. Edible glitter and spooky-shaped sprinkles add extra flair.

How should I store these brownies?

Store leftover brownies in an airtight container at room temperature for up to 3 days, or in the refrigerator for up to a week. You can freeze frosted brownies for longer storage; they’ll thaw beautifully.

Are these brownies good for kids?

These brownies are definitely kid-friendly! They’re easy to eat, and the fun decorations make them extra appealing for little ones. You can even involve them in the decorating process, allowing them to create little monsters themselves.

How to Serve

Monster Mash Brownies served on a plate with a glass of milk.
The perfect Halloween treat!

These Monster Mash Brownies are a perfect Halloween treat. Serve them on a spooky platter with a side of vanilla ice cream or whipped cream. A glass of ice-cold milk pairs wonderfully, balancing out the richness of the brownies. For an extra festive touch, sprinkle some extra Halloween candies around the platter. Looking for more ideas? Our Lunch category has some great options to accompany these treats.

That’s a Wrap

These Monster Mash Brownies are guaranteed to be a graveyard smash! They’re easy to make, and a frightfully delightful treat for all ages. The colorful frosting, sprinkles, and candy eyes bring a touch of spooky fun to your dessert spread, making them the perfect Halloween party showstopper. Now you’ve got a festive treat in your recipe box that’s as enjoyable to make as it is to eat. For more delicious dessert inspiration, don’t forget to check out our amazing Desserts collection! You can also connect with us on Pinterest, Instagram, and Facebook.

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