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4.67 from 3 votes

Cosmic Brownie Recipe {Easy & Delicious}

This Cosmic Brownie Recipe is so delicious! They are fudgy, chewy, and easy to make. You will love this chocolatey copycat brownie recipe! 
Course: Dessert
Cuisine: American, casual
Keyword: cosmic brownie recipe



  • 1 cup granulated sugar
  • 1 cup light brown sugar
  • 2 tsp vanilla extract
  • 2 eggs
  • 2 egg yolks
  • 1 stick butter melted
  • 1 1/3 cups semisweet chocolate chips
  • 1/2 cup vegetable oil
  • 1 1/4 cup self-rising flour
  • 1/4 cup cocoa powder


  • 4 tbs butter softened
  • 1/2 cup sweetened condensed milk
  • 1 1/3 cups semisweet chocolate chips


  • 1/4 cup rainbow chocolate chips


  • Preheat the oven to 350° F. Spray a 9-by-13 inch pan with baking spray.
  • Combine granulated sugar, light brown sugar, vanilla, whole eggs and yolks in a large bowl.
  • Place chocolate and butter in a microwave-safe bowl, and begin to microwave in 30-second intervals. Stir in between each one until the mixture is fully melted.
  • Pour the chocolate mixture into the sugar mixture and stir until it is fully combined.
  • Add in flour and sugar and gently stir until fully combined.
  • Pour the brownie batter into the prepared pan and bake 30-35 minutes.


  • Place the chocolate chips into a medium-sized bowl and set aside.
  • In a large bowl, combine your sweetened condensed milk and butter. Microwave for 30 seconds and stir, and repeat.
  • When the butter is fully melted, add in the chocolate ads stir until melted. If needed, microwave another 15 seconds until the frosting is smooth.
  • Pour the frosting over the brownies and sprinkle the top with rainbow chips.
  • Let cool completely before serving.
  • Enjoy!