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

Cosmic Brownies

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!
Course Dessert
Cuisine American
Prep Time 15 minutes
Cook Time 20 minutes
Total Time 35 minutes
Servings 12
Calories 300kcal
Author Sara Welch


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


  • 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.


Adapted from Love & Olive Oil.


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