Name: Cosmic Brownies Recipe
Prep time: 10 min
Cook time: 27 min
Total time: 1 h 37 min
Cuisine: American
Ingredients: 1 cup granulated sugar; ⅓ cup light brown sugar (tightly packed); 10 tbsp unsalted butter (melted); ¾ cup cocoa powder; 1 tsp vanilla extract; 2 eggs; 1 egg yolk; ½ cup gluten free flour; 1 tbsp tapioca flour; 1 cup chocolate frosting; ¼ cup rainbow sprinkles

Jump to Recipe· 4.3 from 79 reviews

If you’re craving a rich, fudgy treat that brings back nostalgic memories of childhood, you absolutely must try this Cosmic Brownies Recipe. It’s a vibrant, gluten-free twist on the classic brownie, topped with creamy chocolate frosting and a shower of rainbow sprinkles that make every bite feel like a celebration. This recipe strikes the perfect balance between gooey texture and sweet, chocolaty flavor, making it a guaranteed crowd-pleaser whether for an after-school snack or a joyful dessert to share with friends and family.

Ingredients You’ll Need

The image shows a top view of nine small bowls and a measuring cup arranged on a white marbled surface, each holding different baking ingredients. From top left to bottom right: a clear glass measuring cup with dark brown cocoa powder, a white bowl filled with colorful round sprinkles, a white bowl with light brown soft sugar, a small clear bowl with thick dark brown chocolate paste, a white bowl with bright yellow melted butter, a large clear bowl with white flour, a small white bowl with white powder, a white bowl with fine white granulated sugar, and a small white bowl holding three raw egg yolks and whites. The bowls are close together, showing the contrasting textures and colors of the ingredients. photo taken with an iphone --ar 4:5 --v 7

This Cosmic Brownies Recipe uses a handful of straightforward ingredients that work harmoniously to deliver that irresistible chewy and fudgy brownie base topped with playful sprinkles. Each ingredient has a special role, whether adding moisture, depth of flavor, or that perfect gluten-free texture.

Granulated sugar: Sweetens the brownies and helps create a lovely chewy texture.
Light brown sugar: Adds moisture and a slight caramel undertone for richer flavor.
Unsalted butter (melted): Provides luscious richness and helps bind everything together.
Cocoa powder: Gives the intense chocolate punch that defines these brownies.
Vanilla extract: Enhances the overall flavor and balances the chocolate.
Eggs and egg yolk: Build structure and contribute to the fudgy, dense texture.
Gluten free flour: The base for this recipe, making it accessible for gluten-sensitive friends.
Tapioca flour: Adds chewiness and helps mimic the texture of traditional brownies.
Chocolate frosting: The crowning glory, rich and creamy for that indulgent finish.
Rainbow sprinkles: Bring that iconic cosmic look and add a fun crunchy contrast.

How to Make Cosmic Brownies Recipe

Step 1: Preheat and Prepare Your Pan

Start by heating your oven to 350 degrees Fahrenheit and lining an 8-inch square pan with parchment paper. This setup ensures even baking and makes it super easy to lift the brownies out once cooled.

Step 2: Combine Sugars, Butter, and Cocoa

In a large mixing bowl, vigorously stir together the granulated sugar, light brown sugar, melted butter, and cocoa powder for about two minutes. This blend creates a silky, rich base that will give your brownies their signature deep chocolate flavor.

Step 3: Add Vanilla and Eggs

Pour in the vanilla extract, then add the eggs and egg yolk. Stir everything until thoroughly combined. These ingredients are essential for lending structure and moistness, resulting in that fudge-like texture we all love.

Step 4: Mix in the Flours

Now, add the gluten free flour and tapioca flour into your wet mixture. Stir gently until the batter thickens slightly — it’s ready when it looks dense but still smooth, perfect for baking into dense, chewy brownies.

Step 5: Transfer and Bake

Spread the batter evenly into your prepared pan, smoothing the top to ensure an even bake. Pop it into the oven and bake for 24 to 27 minutes. You’ll know it’s done when a toothpick comes out with just a few moist crumbs clinging to it.

Step 6: Frost and Sprinkle

Once your brownies are fully cooled, generously spread the chocolate frosting over the top. Immediately sprinkle with rainbow sprinkles—this colorful touch makes these brownies truly playful. Then, refrigerate for about an hour so the frosting sets beautifully.

Step 7: Slice and Serve

Finally, slice your cosmic creation into squares and get ready to rave about how magical this Cosmic Brownies Recipe turned out. Each bite is a delicious adventure!

How to Serve Cosmic Brownies Recipe

A single square chocolate brownie sits flat on a white marbled surface. It has one thick layer of smooth, rich chocolate frosting spread evenly across the top with visible soft swirls. Scattered over the frosting are many small round sprinkles in bright colors including yellow, pink, green, blue, white, brown, and orange, giving a playful and cheerful look. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

While the classic rainbow sprinkles are iconic, feel free to add chopped nuts, edible glitter, or even mini chocolate chips as a personalized flourish. These extras can enhance crunch, presentation, and overall fun factor without complicating the recipe.

Side Dishes

Pair your Cosmic Brownies with a scoop of vanilla ice cream or a dollop of whipped cream to complement the rich chocolate. Fresh berries or a drizzle of raspberry sauce provide a delightful contrast to the sweet and fudgy texture.

Creative Ways to Present

For parties, try cutting the brownies into bite-sized squares and placing them on colorful plates or themed trays. Stacking them in a clear glass container layered with frosting and sprinkles creates a stunning dessert parfait that’s sure to impress.

Make Ahead and Storage

Storing Leftovers

Keep any leftover brownies stored in an airtight container at room temperature for up to 3 days. This keeps them moist and delicious without drying out, preserving the texture and frosting beautifully.

Freezing

Cosmic Brownies freeze wonderfully. Wrap individual pieces tightly in plastic wrap, then place them in a freezer-safe container. They can be stored for up to 2 months and thawed overnight in the fridge.

Reheating

To enjoy brownies fresh out of the oven feeling, pop them in the microwave for 10 to 15 seconds. This warms the fudgy center and slightly softens the frosting, reviving that freshly baked flavor and texture.

FAQs

Can I make Cosmic Brownies Recipe dairy-free?

Absolutely! You can substitute the unsalted butter with a dairy-free alternative like coconut oil or vegan butter. Just keep in mind it might slightly alter the texture and flavor, but it’s still wonderfully delicious.

Are these brownies gluten free?

Yes! Thanks to the use of gluten free flour and tapioca flour, this Cosmic Brownies Recipe is safe for anyone avoiding gluten without sacrificing taste or texture.

Can I use regular flour instead of gluten free flour?

Yes, you can substitute with all-purpose flour if you are not avoiding gluten. The texture will be similar, but the recipe was specifically designed to work well with gluten free flour — so be sure to measure accurately.

Do I have to use rainbow sprinkles?

While rainbow sprinkles give the brownies that “cosmic” vibe, feel free to experiment with other toppings like crushed candy, chocolate chips, or nuts if you prefer. The sprinkles just add that joyful pop of color and crunch!

How long do Cosmic Brownies last once frosted?

When stored properly in an airtight container in the refrigerator, the frosted Cosmic Brownies can last up to 5 days. Make sure to bring them to room temperature before serving for the best taste.

Final Thoughts

Making this Cosmic Brownies Recipe is like rolling back to the best parts of childhood, wrapped up in irresistible chocolate and festive sprinkles. Whether you’re baking for a special occasion or just because, this recipe is sure to become one of your favorites. So grab your ingredients, get mixing, and prepare for a cosmic burst of flavor that will brighten anyone’s day!