Homemade Cosmic Brownies Recipe

5 from 23 votes

Mouth-watering, homemade cosmic brownies, topped with chocolate ganache and crunchy rainbow sprinkles. These brownies are out of this world!

Prep Time10

Cook Time30

Course: desserts

Cuisine: American

Servings: servings

Calories: 553kcal

Author: Britney

Preheat the oven to 350 degrees. In a large bowl, whisk together eggs, sugar, brown sugar, oil, and melted butter for 2-3 minutes. Then add vanilla extract and sour cream and continue to whisk until combined and smooth.
Add kosher salt, cocoa powder, and flour and fold together until a thick batter forms and all flour is incorporated.
Line an 8x8 baking pan with parchment paper and add batter. (Must use parchment paper in order to be able to lift the brownies out of the pan after the chocolate ganache is poured on top. If not, the brownies will stick to the pan. Do not skip this step!) Smooth batter to create an even layer and bake for 25-30 minutes, until the edges are crisp and the center is slightly jiggly.
Cool in the baking pan for at least 40 minutes.
Once the brownies have cooled, make the chocolate ganache. Heat heavy cream in the microwave for one minute, then add chocolate chips and whisk together until smooth until all chocolate has melted into the heavy cream (chocolate may break apart at first but will come together as your whisk). If chocolate has not melted completely, add to the microwave for an additional 15 seconds and continue to whisk.
Pour ganache on top of brownies and add sprinkles on top (as many as you would like!). Refrigerate for 1-2 hours, until the ganache topping has set.

(NOTE - it critical to use parchment paper so that you can lift the brownies out of the pan once they are finished cooking. DO NOT SKIP THIS STEP!)