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Homemade Cosmic Brownie Recipe

4.5 from 146 reviews

This Homemade Cosmic Brownie recipe features rich, fudgy brownies topped with a luscious chocolate ganache and colorful rainbow chocolate chips, delivering a nostalgic and indulgent treat perfect for any occasion.

Ingredients

Scale

Brownie Batter

  • 1 cup granulated white sugar
  • 1 cup brown sugar
  • 2 teaspoons vanilla extract
  • 1/2 teaspoon salt
  • 2 large eggs
  • 2 large egg yolks
  • 8 Tablespoons unsalted butter
  • 8 ounces chocolate chips
  • ½ cup vegetable oil
  • 1 ¼ cups all-purpose flour
  • ¼ cup unsweetened cocoa powder

Ganache

  • ½ cup heavy cream
  • 1.5 cups chocolate chips

Topping

  • ¼ cup Rainbow Chocolate Chips

Instructions

  1. Prepare Oven and Pan: Preheat your oven to 350°F. Line a 9×13 inch baking dish with parchment paper and generously spray with cooking spray to prevent sticking.
  2. Mix Sugars and Eggs: In a large bowl, combine granulated sugar, brown sugar, vanilla extract, salt, whole eggs, and egg yolks. Whisk thoroughly until the mixture is smooth and homogenous.
  3. Melt Butter and Chocolate: Place butter and 8 ounces of chocolate chips in a microwave-safe bowl. Microwave in 30-second intervals, stirring between each, until fully melted and smooth.
  4. Add Oil to Chocolate: Stir vegetable oil into the melted chocolate mixture until well incorporated.
  5. Combine Chocolate with Sugar Mixture: Pour the chocolate mixture into the sugar-egg mixture and mix until fully combined.
  6. Fold in Dry Ingredients: Gently fold in all-purpose flour and cocoa powder, mixing just until combined to avoid overworking the batter.
  7. Bake the Brownies: Pour the brownie batter into the prepared pan and bake in the preheated oven for 30 to 35 minutes. Check doneness by inserting a toothpick into the center; it should come out clean.
  8. Heat Cream for Ganache: Pour heavy cream into a microwave-safe bowl and heat in the microwave for 1 minute until just hot but not boiling.
  9. Prepare Ganache: Add 1.5 cups chocolate chips to the heated cream. Let sit for 2 minutes, then stir vigorously until the ganache is smooth and glossy.
  10. Apply Ganache and Add Toppings: Pour ganache evenly over the cooled brownies using an offset spatula for smoothness. Immediately sprinkle with rainbow chocolate chips so they stick.
  11. Cool and Serve: Allow the brownies to cool completely so the ganache sets before slicing into pieces.

Notes

  • Use parchment paper for easy removal and clean edges.
  • Do not overbake to keep the brownies fudgy.
  • Let brownies cool before topping with ganache to prevent melting the chips.
  • Microwave melting in short intervals prevents burning the chocolate.
  • For added texture, use chunky or salted chocolate chips in the batter.

Keywords: Cosmic Brownies, homemade brownies, chocolate ganache, rainbow chocolate chips, fudgy brownies, easy dessert