These Cosmic Brownie Cookies are a rich, fudgy twist on the nostalgic Cosmic Brownies we all loved growing up—complete with a chewy brownie base, glossy chocolate ganache, and signature rainbow sprinkles. Designed to mimic the popular Crumbl Cookies version, these treats are easy to whip up and guaranteed to satisfy any chocolate craving.
Why You’ll Love This Recipe
These cookies bring the best of both worlds—cookies and brownies—into one decadent dessert. You’ll love them for their soft, fudgy centers and rich chocolate flavor, balanced with a smooth ganache topping and cheerful sprinkles. Whether you’re making them for a party, bake sale, or just a cozy night in, these cookies are fun, festive, and undeniably delicious.
Ingredients
(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)
For the Brownie Cookies:
1 box brownie mix (18–19 oz)
1/4 cup all-purpose flour
2 large eggs
1/4 cup vegetable oil
2 tbsp water
1 tsp vanilla extract
For the Chocolate Ganache Topping:
1 cup semisweet chocolate chips
1/2 cup heavy cream
For the Cosmic Topping:
Rainbow candy-coated cosmic sprinkles (like the ones used on Cosmic Brownies)
Directions
Make the Cookie Dough:
Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.
In a large bowl, mix the brownie mix, flour, eggs, oil, water, and vanilla extract until a thick, sticky dough forms.
Bake:
Scoop out dough using about 2 tablespoons per cookie.
Arrange on the baking sheet with about 2 inches of space between each ball.
Bake for 10–12 minutes, just until the edges are set and centers are slightly soft.
Let cookies cool completely before adding the topping.
Prepare the Ganache:
Heat the heavy cream in the microwave for 45 seconds to 1 minute, just until hot (not boiling).
Pour the hot cream over the chocolate chips in a bowl and let it sit for 1 minute.
Stir until smooth and glossy, then let it cool slightly until thick but spreadable.
Assemble:
Spread a layer of ganache over each cooled cookie.
Immediately top with rainbow candy-coated sprinkles for that classic cosmic effect.
Servings and timing
Servings: Makes approximately 12 cookies Prep Time: 10 minutes Cook Time: 10–12 minutes Cooling & Assembly Time: 20 minutes Total Time: Around 40–45 minutes
Variations
Espresso Kick: Add 1/2 teaspoon of espresso powder to the dough to intensify the chocolate flavor.
Nutty Crunch: Sprinkle chopped walnuts or pecans over the ganache for added texture.
Mint Chocolate: Add a few drops of peppermint extract to the ganache for a holiday twist.
Gluten-Free Option: Use a gluten-free brownie mix and flour substitute.
Mini Cookies: Use a smaller cookie scoop for bite-sized versions—perfect for party trays.
Storage/Reheating
Store cookies in an airtight container at room temperature for up to 3 days. For longer storage, refrigerate for up to 1 week. If stacking, chill the cookies first to firm up the ganache. You can also freeze them (without the ganache) for up to 2 months. Thaw before topping and serving.
FAQs
How do I know when the cookies are done baking?
The edges should be set, and the centers will still look slightly soft—that’s perfect for a fudgy texture. They’ll continue to firm up as they cool.
Can I use homemade brownie batter instead of a box mix?
Yes, but you’ll want a thicker consistency. Use a recipe that mimics boxed brownie batter or reduce liquid slightly.
Can I make the ganache ahead of time?
Absolutely. Store it in the fridge for up to 3 days and reheat gently to return it to a spreadable consistency.
Do I have to use heavy cream for the ganache?
Heavy cream works best for a smooth and rich ganache, but in a pinch, you can use full-fat coconut milk or evaporated milk.
Can I double the recipe?
Yes, just double all the ingredients. Bake in batches to maintain proper spacing and texture.
Are these cookies chewy or cakey?
They’re more on the chewy, fudgy side—like the center of a brownie.
What kind of sprinkles should I use?
Use rainbow candy-coated chocolate chips or similar sprinkles for the classic cosmic brownie look.
Can I freeze these cookies?
Yes. Freeze the cookies without ganache for up to 2 months. Thaw before topping and serving.
Can I use milk chocolate chips instead of semisweet?
Yes, but the ganache will be sweeter. Adjust to your preference.
Why is my dough too sticky?
This dough is naturally sticky due to the brownie mix. Chill it briefly if needed for easier handling.
Conclusion
Cosmic Brownie Cookies are a delightful treat that brings back childhood memories with a gourmet twist. They’re simple to make, visually fun, and rich in chocolatey goodness. Whether you’re baking for friends, family, or just yourself, these cookies are sure to impress and disappear fast.
These Cosmic Brownie Cookies are a Crumbl Cookie copycat featuring fudgy brownie-based cookies topped with smooth chocolate ganache and colorful candy-coated sprinkles for a nostalgic and indulgent treat.
Ingredients
1 box brownie mix (18–19 oz)
1/4 cup all-purpose flour
2 large eggs
1/4 cup vegetable oil
2 tbsp water
1 tsp vanilla extract
1 cup semisweet chocolate chips
1/2 cup heavy cream
Rainbow candy-coated cosmic sprinkles
Instructions
Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.
In a large bowl, mix brownie mix, flour, eggs, oil, water, and vanilla extract until a thick dough forms.
Scoop about 2 tablespoons of dough per cookie and place on the prepared baking sheet, spacing 2 inches apart.
Bake for 10–12 minutes until edges are set and centers are slightly soft. Let cool completely.
To make the ganache, heat heavy cream in the microwave for 45 seconds to 1 minute until hot.
Pour hot cream over chocolate chips and let sit for 1 minute. Stir until smooth and glossy.
Let ganache cool slightly until thick but spreadable.
Spread ganache over each cooled cookie and immediately top with cosmic sprinkles.
Notes
Use full-fat coconut milk as a substitute for heavy cream if needed.
Chill dough briefly if it’s too sticky to handle.
Store ganache in the fridge for up to 3 days; reheat gently before using.
For gluten-free cookies, use gluten-free brownie mix and flour substitute.
Freeze cookies without ganache for longer storage.
