Cosmic Brownies Recipe
Introduction
Cosmic Brownies are a delightful twist on the classic chocolate brownie, topped with a rich ganache and colorful candy-coated sprinkles. Perfect for parties or an everyday treat, these brownies combine fudgy texture with a fun, festive look.

Ingredients
- 3/4 cup unsalted butter, melted
- 1 cup granulated sugar
- 1/2 cup light brown sugar, packed
- 2 large eggs
- 1 tablespoon vanilla extract
- 3/4 cup unsweetened cocoa powder
- 1/2 teaspoon salt
- 2/3 cup all-purpose flour
- 1 tablespoon cornstarch
- 1/4 teaspoon baking powder
- 1 cup semi-sweet chocolate chips
- 1/2 cup heavy cream
- 1 pinch salt
- Rainbow candy-coated mini chips or sprinkles
Instructions
- Step 1: Preheat the oven to 325°F (163°C) and line an 8×8 inch pan with parchment paper. Lightly spray with non-stick spray.
- Step 2: In a bowl, whisk together the melted butter, granulated sugar, and brown sugar until smooth.
- Step 3: Add the eggs and vanilla extract. Whisk until the mixture is pale and fluffy.
- Step 4: Sift in the cocoa powder, flour, cornstarch, salt, and baking powder. Fold gently until just combined.
- Step 5: Pour the batter into the prepared pan, smooth the top, and bake for 30–35 minutes. Let the brownies cool completely.
- Step 6: Heat the heavy cream until it is simmering. Pour over the chocolate chips and let sit for 2–3 minutes, then stir until a smooth ganache forms. Add a pinch of salt.
- Step 7: Pour the ganache over the cooled brownies and spread evenly. Top with rainbow candy-coated mini chips or sprinkles.
- Step 8: Chill for at least 1 hour to set the ganache. Slice with a warm knife for clean edges and serve.
Tips & Variations
- Use a warm knife dipped in hot water and wiped dry to slice brownies cleanly without cracking the ganache.
- For extra fudgy brownies, slightly underbake by a few minutes and allow to cool completely before adding ganache.
- Swap the rainbow chips for chopped nuts or shredded coconut for a different texture and flavor.
- Make the ganache with dark or white chocolate instead of semi-sweet for variation.
Storage
Store the brownies in an airtight container in the refrigerator for up to 5 days to keep the ganache firm. Before serving, bring to room temperature for about 20 minutes for the best texture. These brownies can also be frozen for up to 3 months; thaw overnight in the refrigerator and bring to room temperature before serving.
How to Serve

Serve this delicious recipe with your favorite sides.
FAQs
Can I use salted butter instead of unsalted?
Yes, but reduce or omit the additional salt in the recipe to avoid over-salting your brownies.
What if I don’t have cornstarch?
You can omit the cornstarch or substitute with an equal amount of flour; cornstarch helps to tenderize the brownies slightly but isn’t essential.
Print
Cosmic Brownies Recipe
- Total Time: 50 minutes plus 1 hour chilling
- Yield: 12 servings 1x
- Diet: Vegetarian
Description
These Cosmic Brownies are rich, fudgy, and topped with a smooth chocolate ganache and colorful rainbow candy-coated mini chips. Perfectly baked and chilled to set the ganache, these brownies deliver a delightful combination of deep chocolate flavor and fun crunch in every bite.
Ingredients
Brownie Batter
- 3/4 cup unsalted butter, melted
- 1 cup granulated sugar
- 1/2 cup light brown sugar, packed
- 2 large eggs
- 1 tablespoon vanilla extract
- 3/4 cup unsweetened cocoa powder
- 1/2 teaspoon salt
- 2/3 cup all-purpose flour
- 1 tablespoon cornstarch
- 1/4 teaspoon baking powder
- 1 cup semi-sweet chocolate chips
Ganache Topping
- 1/2 cup heavy cream
- 1 pinch salt
- Rainbow candy-coated mini chips or sprinkles
Instructions
- Preheat and Prepare Pan: Preheat your oven to 325°F (163°C) and line an 8×8 inch baking pan with parchment paper. Lightly spray the parchment with non-stick spray to ensure easy removal of the brownies.
- Mix Butter and Sugars: In a mixing bowl, whisk together the melted unsalted butter, granulated sugar, and light brown sugar until the mixture is fully smooth and well combined.
- Add Eggs and Vanilla: Add the two large eggs and one tablespoon of vanilla extract to the sugar and butter mixture. Whisk vigorously until the batter becomes pale in color and fluffy in texture, which usually takes a couple of minutes.
- Incorporate Dry Ingredients: Sift together the unsweetened cocoa powder, all-purpose flour, cornstarch, salt, and baking powder. Gently fold these dry ingredients into the wet mixture until just combined, being careful not to overmix to maintain a tender crumb.
- Bake the Brownies: Pour the batter evenly into the prepared pan and smooth the top with a spatula. Bake in the preheated oven for 30 to 35 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs. Allow the brownies to cool completely in the pan.
- Prepare Ganache: Heat the heavy cream in a small saucepan over medium heat until it begins to simmer. Remove from heat and pour the hot cream over the semi-sweet chocolate chips in a bowl. Let it rest for 2 to 3 minutes to soften the chocolate, then stir until a smooth, glossy ganache forms. Add a pinch of salt to enhance the flavor.
- Top and Garnish: Pour the ganache evenly over the cooled brownies, spreading it with a spatula for a smooth finish. Immediately sprinkle the top with rainbow candy-coated mini chips or sprinkles to add a colorful crunch.
- Chill and Serve: Place the brownies in the refrigerator and chill for at least 1 hour to allow the ganache to set properly. Use a warm knife to slice the brownies into 12 servings for clean edges, and enjoy!
Notes
- Ensure brownies are completely cooled before pouring ganache to prevent melting and mixing.
- Use parchment paper to make it easier to remove brownies from the pan without breaking.
- For extra fudginess, slightly underbake the brownies but ensure eggs are fully cooked.
- Warm the knife under hot water and dry it before slicing to get smooth cuts.
- Store leftovers covered in the refrigerator for up to 4 days.
- Prep Time: 15 minutes
- Cook Time: 35 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American
Keywords: cosmic brownies, chocolate brownies, ganache brownies, fudgy brownies, rainbow brownies, chocolate dessert, party treats

