Crumbl Cosmic Brownie Cookies (Fudgy Copycat with Rainbow Chips)
If you love nostalgic cosmic brownies, these Crumbl Cosmic Brownie Cookies are about to become your new obsession. Thick, ultra-fudgy chocolate cookies are topped with a silky chocolate ganache and finished with bright rainbow candy chips for that iconic bakery-style look.These cookies combine everything you love about classic lunchbox brownies with the oversized, indulgent texture of Crumbl cookies. They’re rich, soft, and intensely chocolatey—perfect for parties, gifting, or leveling up your dessert game.
Servings 10 large cookies
Calories 420kcal
Cost $9 for entire recipe
Equipment
- Mixing bowls
- Whisk
- Silicone spatula
- Measuring cups and spoons
- Baking sheet
- Parchment paper
- Cookie scoop (large, 1/4 cup)
- wire cooling rack
- Microwave-safe bowl or small saucepan (for ganache)
Ingredients
Cookies
- 1 cup 226g unsalted butter, melted
- 1 1/4 cups brown sugar
- 1/2 cup granulated sugar
- 2 large eggs
- 1 large egg yolk optional, for extra fudgy texture
- 1 tbsp vanilla extract
- 1 1/4 cups all-purpose flour
- 3/4 cup cocoa powder Dutch-process preferred
- 1/2 tsp baking soda
- 1/2 tsp baking powder
- 1/2 tsp salt
- 1/2 cup chocolate chips
Ganache
- 1/2 cup heavy cream
- 1 1/2 cups semi-sweet chocolate chips
Topping
- 1/2 cup rainbow candy-coated chocolate chips
Instructions
- Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
Mix wet ingredients:
- In a large bowl, whisk melted butter, brown sugar, and granulated sugar until smooth and glossy. Add eggs, egg yolk (if using), and vanilla extract. Mix until thick and fully combined.
Add dry ingredients:
- Stir in flour, cocoa powder, baking soda, baking powder, and salt until just combined. Fold in chocolate chips.
Chill dough:
- Refrigerate for 20–30 minutes to prevent spreading and create thick cookies.
Scoop cookies:
- Portion large 1/4 cup-sized dough balls. Roll and gently flatten slightly.
Bake:
- Bake for 10–12 minutes. Edges should be set while centers remain soft and fudgy. Do not overbake.
Cool completely:
- Let cookies cool on the baking sheet for 10 minutes, then transfer to a rack to cool fully before topping.
Make ganache:
- Heat heavy cream until steaming (not boiling). Pour over chocolate chips and let sit for 2 minutes. Stir until smooth and glossy.
Assemble:
- Spread ganache over each cooled cookie and immediately sprinkle with rainbow candy chips.
Set:
- Allow ganache to set for 15–20 minutes before serving.
Notes
- For the best results, use Dutch-process cocoa powder to achieve a deeper, richer chocolate flavor that closely mimics Crumbl Cosmic Brownie Cookies.
- Chilling the dough is essential for creating thick, bakery-style brownie cookies that don’t spread too much while baking.
- Slightly underbake the cookies for a soft, fudgy center—they will continue to set as they cool.
- Allow cookies to cool completely before adding ganache to ensure the topping sets properly and doesn’t melt off.
- Use high-quality chocolate chips for the ganache to get a smooth, glossy finish similar to Crumbl cookies.
- Add rainbow candy chips while the ganache is still warm so they stick and create that classic cosmic brownie look.
- For extra richness and a more indulgent texture, add one additional egg yolk to the dough.
- These cookies are best enjoyed slightly soft at room temperature for the ultimate bakery-style experience.