These Cosmic Brownies are cocoa brownies topped off with a rich chocolate fudge topping and rainbow sprinkles. A copycat of the Little Debbie classic that tastes even better than the original version!

When I’m looking for a fun treat for the kids, I make chocolate fondue, cake balls, fruit pizza or these bright and colorful homemade Cosmic Brownies. But let’s be real – the adults love these brownies just as much as the kids do. If you love brownie recipes, you’ll also adore my red velvet brownies, cheesecake brownies, Oreo brownies and blondies recipe.

A stack of cosmic brownies on a plate with a bite taken out of one.

I grew up eating Cosmic Brownies from the Little Debbie box, and I wanted to share those awesome little fudgy bites with my kids. I decided to skip the grocery store and instead make a homemade version of these fudgy brownies which is SO much more flavorful than the original.

Cosmic Brownies Ingredients

To make this recipe, you will need butter, sugar, eggs, vanilla extract, all purpose flour, cocoa powder, salt, milk, semisweet chocolate, milk chocolate, heavy cream and rainbow chip sprinkles.

Cocoa powder and flour in a bowl of melted butter and sugar.

How Do You Make Cosmic Brownies?

Line a baking pan with parchment paper, and coat it in cooking spray. Melt the butter, then add the sugar and whisk to combine. Next, beat the sugar and butter mixture and add eggs and vanilla to the bowl. Finally, add the dry ingredients of flour, cocoa powder and salt, and mix until the ingredients are just combined. Pour the batter into the pan and spread it into an even layer. Bake the brownies, then let them cool. To make the frosting, heat the heavy cream and add the milk and semisweet chocolate to the cream. Stir the chocolate and cream together until smooth, then add butter. Pour the frosting over the brownies in an even layer. Add the sprinkles on top, then chill the brownies until they are set. Cut into squares, then serve and enjoy.

A bowl of cocoa brownie batter.

Tips For Cosmic Brownies

  • The candy coated chocolate pieces can be purchased online, at grocery stores, or at craft stores. I used Wilton’s Rainbow Chip Crunch which I purchased in the cake decorating aisle of my local craft store. Can’t find the rainbow chips? You can use regular miniature chocolate chips or a different type of rainbow sprinkles instead.
  • It’s best to use chopped bars of chocolate instead of chocolate chips for the fudge topping. Chocolate chips often contain stabilizers and will not melt as smoothly as chopped chocolate. I used Ghirardelli brand chocolate bars which I found in the baking area near the chocolate chips.
  • These brownies are best stored in the fridge in an airtight container. If you make the brownies on a hot day and leave them at room temperature, the frosting can get quite soft.

Quick Tip

Be sure to keep an eye on your brownies so they don’t overcook! Otherwise you won’t end up with that irresistible fudgy texture.

A pan of cosmic brownies with rainbow sprinkles on top.

Recipe FAQs

What are cosmic brownies made of?

Cosmic Brownies are a fudgy chocolate brownie topped with a thick chocolate frosting and rainbow candy coated sprinkles. They were made famous by the Little Debbie Company.

How long do brownies last?

These brownies can be stored in an airtight container in the refrigerator for up to 5 days. I find that they never last that long though! Let the brownies sit at room temperature for about 10-15 minutes before you serve them to take the chill off.

Can you freeze brownies?

Cosmic Brownies are a great candidate for the freezer. Simply wrap the bars individually with plastic wrap, then place them in a resealable bag in the freezer for up to 2 months. You can thaw your brownies at room temperature when you’re ready to eat them.

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Cosmic brownies topped with chocolate fudge and crunchy rainbow sprinkles.

Flavor Variations

While these brownies are fabulous as-is, you can add other ingredients to customize the flavors to your tastes. Just be aware that while these changes are delicious, they are not traditionally found in a copycat Cosmic Brownie!

  • Add-Ins: You can stir up to 1/2 cup of chocolate chips or nuts into the batter before the brownies go into the oven.
  • Toppings: Instead of rainbow chips, try regular mini chocolate chips, rainbow sprinkles, chocolate jimmies, finely diced nuts, mini M&M’s or toffee bits.

These brownies are definitely not just for the kids. They’re a great addition to any dessert table along with options such as gooey butter cookies, chocolate lasagna, chocolate chip cupcakes and Oreo cookies and cream bars. You’re sure to get rave reviews!

More Fabulous Sweet Treats

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5 from 19 votes

Cosmic Brownies

AuthorSara Welch
A stack of cosmic brownies on a plate with a bite taken out of one.
These Cosmic Brownies are cocoa brownies topped off with a rich chocolate fudge topping and rainbow sprinkles. A copycat of the Little Debbie classic that tastes even better than the original version!
Time
Prep Time15 minutes
Cook Time20 minutes
Total Time35 minutes
Course Dessert
Cuisine American
Serves 12

Ingredients 

For the brownies

  • 6 tablespoons unsalted butter
  • 1 cup granulated sugar
  • 2 eggs
  • 1 1/2 teaspoons vanilla extract
  • 1/2 cup all purpose flour
  • 1/2 cup cocoa powder
  • 1/4 teaspoon salt
  • 2 tablespoons milk
  • cooking spray

For the frosting

  • 4 ounces semisweet chocolate chopped
  • 4 ounces milk chocolate chopped
  • 1/2 cup heavy cream
  • 1 tablespoon butter cut into 4 pieces
  • 1/2 cup rainbow chip sprinkles

Instructions 

  • Preheat the oven to 350 degrees F. Line a 9″ x 9″ square pan with a piece of parchment paper, leaving an overhang on both sides. Coat the pan with cooking spray.
  • Place the butter in a large microwave safe bowl. Microwave in 30 second increments until melted.
  • Add the sugar to the melted butter and whisk to combine.
  • Place the sugar and butter mixture in the bowl of a mixer. Beat on medium speed for 2-3 minutes.
  • Add the eggs and vanilla to the bowl; then beat for another 2-3 minutes until mixture is pale yellow and thick.
  • Add the flour, cocoa powder and salt. Mix on low speed until ingredients are just incorporated. Stir in the milk and mix until smooth.
  • Pour the batter into the prepared pan, and spread it into an even layer.
  • Bake for 20-25 minutes until a toothpick inserted into the center of the pan comes out clean or with just a few crumbs attached to it.
  • Let the brownies cool.
  • Place the heavy cream in a medium bowl. Microwave in 20 second increments until cream is very hot but not boiling.
  • Add the chopped chocolates to the cream. Let sit for a minute, then stir until a smooth chocolate mixture forms. Stir in the butter until melted.
  • Pour the chocolate over the top of the brownies. Use a spatula to spread the chocolate into an even layer. Add the sprinkles on top of the chocolate.
  • Chill the brownies until set, about 1-2 hours. Use the parchment to lift the brownies out of the pan. Cut into squares and serve.

Notes

  1. The candy coated chocolate pieces can be purchased online, at grocery stores, or at craft stores. I used Wilton’s Rainbow Chip Crunch which I purchased in the cake decorating aisle of my local craft store. 
  2. It’s best to use chopped bars of chocolate instead of chocolate chips for the fudge topping. Chocolate chips often contain stabilizers and will not melt as smoothly as chopped chocolate. I used Ghirardelli brand chocolate bars which I found in the baking area near the chocolate chips.

Nutrition

Calories: 300kcal | Carbohydrates: 33g | Protein: 3g | Fat: 18g | Saturated Fat: 11g | Cholesterol: 59mg | Sodium: 76mg | Potassium: 162mg | Fiber: 2g | Sugar: 25g | Vitamin A: 395IU | Calcium: 28mg | Iron: 1.7mg

Hello! I’m Sara!

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5 from 19 votes (1 rating without comment)

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Comments

  1. 5 stars
    These Cosmic Brownies are like a blast from the past and a chocolatey delight all in one – couldn’t get enough!

  2. 5 stars
    Really like this Cosmic Brownies recipe, looks easy, fun and delicious!!! will try and make them for my kiddos. Thanks for sharing 🙂

  3. 5 stars
    We love cosmic brownies, they’re our favorite snack! These might even be better than the ones at the store – so fudgy and sweet.

  4. This is an awesome recipe! My family loves it !! : ) I was looking for a HomeMade version of the little Debbie cosmic brownies, this fits the bill with flying colors . Thank you for posting this recipe!! 😁

      1. Typically craft stores with a cake decorating area have them such as JoAnn’s or Michaels. They’re also often available on Amazon.

  5. Okay I love brownies — all of the brownie — but I’d be satisfied with just that fudgy frosting! Mmm! On second thought, I’ll take the whole thing 😉

  6. 5 stars
    These look amazing! I like to add chocolate chips to my brownies—both white and semi-sweet chocolate. Just a handful total.
    It adds another flavor pop!

  7. 5 stars
    What’s not to love about these sweet treats?! These look fun and delicious; excited to make these for my daughter’s 7th birthday!