Go Back
Cosmic Brownie Cake
Print Recipe Pin Recipe
No ratings yet

Cosmic Brownie Cake

Prep Time20 mins
Cook Time30 mins
Total Time50 mins


  • For the cake use your favorite boxed chocolate cake mix and bake in a 13 x 9 inch pan according to package directions.

  • For the buttercream:

  • 1/2 cup shortening
  • 1/2 cup butter softened
  • 3/4 cup cocoa powder
  • 4 cups powdered sugar
  • 4-8 tablespoons milk
  • 2 teaspoons vanilla extract
  • 1/4 cup rainbow chocolate chip sprinkles


  • Once cake is baked, let cool for about 20 minutes and then remove from pan. Let cool completely.
  • Next, make the buttercream. In the bowl of a stand mixer fitted with the paddle attachment, cream together the shortening and butter till smooth.
  • Add in the cocoa powder and powdered sugar. Mix. Add in the vanilla and then the milk as needed to get a light fluffy texture. Continue to beat on medium for 1 more minute.
  • Spread an even layer of frosting over the entire cake and smooth with an offset spatula.
  • Using a knife or spatula, draw a line across the middle in the frosting.
  • Top the cake with the rainbow chocolate chip sprinkles.
Tried this recipe?Mention @studiodiy or tag #studiodiy!