Easy Homemade Cosmic Brownies Recipe

There’s something irresistibly nostalgic about recreating your favorite childhood snacks, and this cosmic brownies recipe delivers just that nostalgia in bite-sized goodness. Not only are these homemade treats ultra-chewy and fudgy, but they also capture the vibrant essence of the original Cosmic Brownies with their iconic chocolate icing and colorful candy-coated topping.
Growing up, my siblings and I would always fight over the last cosmic brownie in the lunchbox, each bite taking us to a chocolatey heaven. This recipe, passed down from my grandmother’s secret stash, has become a family staple. It reminds us of those carefree summer days running through sprinklers with chocolate-smudged grins.
Why You’ll Love This Recipe
These homemade brownies bring comfort and joy with every bite. Whether you’re looking for a quick dessert fix or a sweet addition to a kid’s party, this recipe is sure to impress. Each brownie is soft, dense, and topped with the perfect blend of ganache and colorful sprinkles. Plus, they’re straightforward to make, requiring simple ingredients you likely already have in your pantry.
Ingredients Notes
The beauty of this recipe lies in its simplicity with a touch of indulgence. Use high-quality unsweetened cocoa powder for the deepest chocolate flavor. For the colorful toppings, you can find candy-coated chocolates in the baking aisle or substitute with mini M&M’s for extra fun. If you’re aiming for a gluten-free version, simply replace the all-purpose flour with a gluten-free blend.
Recipe Steps
Step 1
Preheat your oven to 350°F (175°C) and prepare an 8×8-inch baking dish by lining it with parchment paper, allowing some overhang for easy removal.
Step 2
In a large mixing bowl, whisk together the melted butter and sugar until fully combined. Add the eggs and vanilla extract, mixing until smooth.
Step 3
Gradually stir in the flour, cocoa powder, and salt, blending until there are no lingering dry spots. Be careful not to overmix to keep the brownies tender.
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Step 4
Pour the batter into your prepared baking dish, smoothing the top with a spatula. Bake for 20-25 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.
Step 5
Allow the brownies to cool completely before spreading a thick layer of chocolate ganache on top. Quickly scatter the candy-coated chocolates over the ganache before it sets.
Storage Options
These brownies can be stored in an airtight container at room temperature for up to 4 days. For longer freshness, refrigerate them for up to a week. For even longer storage, wrap the brownies individually in plastic wrap and freeze them for up to 3 months. When ready to enjoy, thaw at room temperature or warm briefly in the microwave.
Variations & Substitutions
For a nutty twist, add a handful of chopped walnuts or pecans to the batter before baking. To accommodate dietary restrictions, substitute the butter with coconut oil and use dairy-free chocolate chips for a vegan variant. Adding a pinch of espresso powder to the batter will elevate the chocolate flavor, giving it a mocha-like richness that coffee lovers will adore.
Serving Suggestions
These brownies are perfect for all occasions, from after-school snacks to holiday dessert tables. Serve them warm with a scoop of vanilla ice cream, or bring them to the next family gathering as a delightful homemade treat. Pair with a cold glass of milk or a hot cup of coffee for the ultimate indulgence.
Frequently Asked Questions
How do I know when the brownies are fully baked? The best indicator is the toothpick test—insert a toothpick into the center, and if it comes out with a few moist crumbs, the brownies are done. Avoid overbaking, as this can lead to dry, crumbly brownies.
Can I double this recipe to fit a 9×13 pan? Absolutely! Doubling the recipe will yield enough batter to fill a 9×13-inch pan. Adjust the baking time slightly, checking for doneness around 30-35 minutes with the toothpick test.
What can I use if I don’t have cocoa powder? If you’re out of cocoa powder, unsweetened chocolate can be used as a substitute. Melt 2 ounces of unsweetened chocolate and reduce the butter in the recipe by 2 tablespoons. This adjustment maintains the rich chocolate flavor and texture.

Easy Homemade Cosmic Brownies Recipe
Ingredients
- For the Brownies:
- 1/2 lb 2 sticks unsalted butter
- 1 1/4 cups granulated sugar
- 3/4 cup brown sugar
- 4 large eggs
- 1 tablespoon vanilla extract
- 3/4 cup unsweetened cocoa powder
- 1/2 teaspoon salt
- 1 cup all-purpose flour
- For the Ganache:
- 1/2 cup heavy cream
- 1 1/2 cups semisweet chocolate chips
- Topping:
- 1/4 cup rainbow candy-coated chocolate chips or mini M&M’s or sprinkles
Instructions
- Make the Brownies:
- Preheat oven to 350°F (175°C). Line a 9x13-inch pan with parchment paper and lightly grease it.
- In a saucepan over medium heat, melt the butter. Remove from heat and whisk in sugars until smooth.
- Add eggs and vanilla, whisking until fully incorporated.
- Stir in cocoa powder and salt, then fold in the flour until just combined—do not overmix.
- Pour into prepared pan and smooth the top. Bake for 18–22 minutes, until the edges are set and a toothpick comes out with just a few moist crumbs. Let cool completely in the pan.
- Make the Ganache:
- Heat cream in a small saucepan or microwave until just beginning to simmer.
- Pour over chocolate chips in a heatproof bowl. Let sit 2 minutes, then stir until smooth and glossy.
- Spread ganache evenly over the cooled brownies.
- Finish with Topping:
- Immediately sprinkle the candy-coated chips over the ganache.
- Chill in the fridge for at least 1 hour until the ganache sets. Slice into 12 bars and serve.