Cosmic Brownies Recipe

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Nicholas Published: December 9, 2020 Modified: June 1, 2021

How To Make Cosmic Brownies

These colorful cosmic brownies will be a sure treat for kids and adults alike! Whip up a batch of these fudgy chocolate brownies in no time for a tasteful dessert.

Preparation: 15 minutes
Cooking: 20 minutes
Chill Time: 1 hour
Total: 1 hour 35 minutes



For Brownies:

  • 6tbspunsalted butter
  • 1cupgranulated sugar
  • 2eggs
  • tspvanilla extract
  • ½cupall purpose flour
  • ½cupcocoa powder
  • ¼tspsalt
  • 2tbspmilk
  • cooking spray

For Frosting:

  • 4ozsemisweet chocolate,chopped
  • 4ozmilk chocolate,chopped
  • ½cupheavy cream
  • 1tbspbutter,cut into 4 pieces
  • ½cuprainbow chip sprinkles


  1. Preheat the oven to 350 degrees F.

  2. Line a 9 x 9-inch square pan with a piece of parchment paper, leaving an overhang on both sides. Coat the pan with cooking spray.

  3. Place the butter in a large microwave safe bowl, then microwave in 30 second increments until melted.

  4. Add the sugar to the melted butter, then whisk to combine.

  5. Place the sugar and butter mixture in the bowl of a mixer, then beat on medium speed for 2 to 3 minutes.

  6. Add the eggs and vanilla to the bowl; then beat for another 2 to 3 minutes until mixture is pale yellow and thick.

  7. Add the flour, cocoa powder and salt.

  8. Mix on low speed until the ingredients are just incorporated.

  9. Stir in the milk, then mix until smooth.

  10. Pour the batter into the prepared pan, then spread it into an even layer.

  11. Bake for 20 to 25 minutes until a toothpick inserted into the center of the pan comes out clean or with just a few crumbs attached to it.

  12. Let the brownies cool.

  13. Place the heavy cream in a medium bowl, then microwave in 20 second increments until cream is very hot but not boiling.

  14. Add the chopped chocolates to the cream.

  15. Let sit for 1 minute, then stir until a smooth chocolate mixture forms.

  16. Stir in the butter until melted.

  17. Pour the chocolate over the top of the brownies.

  18. Use a spatula to spread the chocolate into an even layer, then add the sprinkles on top of the chocolate.

  19. Chill the brownies until set, about 1 to 2 hours.

  20. Use the parchment to lift the brownies out of the pan, then Cut into squares.

  21. Serve, and enjoy!


  • Calories: 335.43kcal
  • Fat: 18.20g
  • Saturated Fat: 10.59g
  • Trans Fat: 0.27g
  • Monounsaturated Fat: 5.42g
  • Polyunsaturated Fat: 1.03g
  • Carbohydrates: 43.44g
  • Fiber: 2.35g
  • Sugar: 35.54g
  • Protein: 3.62g
  • Cholesterol: 60.48mg
  • Sodium: 74.69mg
  • Calcium: 41.86mg
  • Potassium: 153.73mg
  • Iron: 1.40mg
  • Vitamin A: 115.61µg
  • Vitamin C: 0.06mg
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