I packed these Copycat Cosmic Brownies with dense, fudgy chocolate and that iconic rainbow candy crunch. One bite and I’m right back to the lunchbox treat everyone wanted to trade for.

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I’m obsessed with these Copycat Cosmic Brownies because they hit that Little Debbie craving, but with a richer, fudgier bite that actually tastes like chocolate. The center is dense in the best way, the frosting is thick and smooth, and those mini colorful chocolate candies on top bring the exact snap I want.

And yes, I absolutely pick the corner piece first. Every time.

I love how the unsweetened cocoa powder gives them that deep brownie flavor without making them fancy or fussy. Just glossy, chewy, chocolate-loaded squares that disappear way too fast from the pan.

No shame. Only crumbs left.

Ingredients

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Melted butter makes these brownies rich, fudgy, and a little dangerously snackable.
Granulated sugar brings that classic chewy sweetness you remember from the lunchbox days.
Eggs hold everything together and help give the brownies that dense bite.
Vanilla adds cozy bakery flavor, so the chocolate doesn’t taste flat.
Cocoa powder gives the brownie base its deep, not-too-fancy chocolate vibe.
Flour keeps them sturdy enough to slice, but still soft in the middle.
Salt balances the sweet stuff, because these are very much dessert.
Baking powder gives just enough lift without making them cakey.
Powdered sugar makes the frosting smooth, sweet, and totally kid-party approved.
More cocoa in the frosting means extra chocolate, which is basically the point.
Milk loosens the frosting so it spreads glossy and thick.
Plus, colorful candies add crunch, nostalgia, and that cosmic brownie look.

Ingredient Quantities

1/2 cup (1 stick) unsalted butter, melted

1 cup granulated sugar

2 large eggs, room temperature

1 teaspoon vanilla extract

1/3 cup unsweetened cocoa powder, sifted

1/2 cup all purpose flour

1/4 teaspoon salt

1/4 teaspoon baking powder

2 cups powdered sugar

1/4 cup unsweetened cocoa powder for frosting

2 tablespoons unsalted butter, melted for frosting

2 to 3 tablespoons milk for frosting

1 teaspoon vanilla extract for frosting

1/2 to 3/4 cup mini colorful chocolate candies (M&M style) for topping

How to Make this

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1. Preheat oven to 350 F and line an 8×8 inch baking pan with parchment paper or grease the pan.

2. In a medium bowl whisk together 1/2 cup melted unsalted butter and 1 cup granulated sugar until smooth.

3. Add 2 room temperature eggs and 1 teaspoon vanilla extract to the butter mixture and beat until fully combined.

4. Sift 1/3 cup unsweetened cocoa powder into the wet ingredients, then stir in 1/2 cup all purpose flour, 1/4 teaspoon salt, and 1/4 teaspoon baking powder until just combined and glossy batter forms.

5. Pour the batter into the prepared pan, smooth the top, and bake 20 to 25 minutes until a toothpick inserted near the center comes out with a few moist crumbs but not raw batter.

6. Let the brownies cool completely in the pan on a wire rack while you make the frosting.

7. For the frosting combine 2 cups powdered sugar, 1/4 cup unsweetened cocoa powder, 2 tablespoons melted unsalted butter, 2 to 3 tablespoons milk, and 1 teaspoon vanilla extract; stir until a thick, spreadable frosting forms, adding milk a little at a time to reach desired consistency.

8. Spread the chocolate frosting evenly over the cooled brownies.

9. Immediately sprinkle 1/2 to 3/4 cup mini colorful chocolate candies over the frosting, press gently so they adhere, then chill the pan for at least 30 minutes to set before cutting into squares.

Equipment Needed

1. 8×8 inch baking pan (lined with parchment or greased)
2. Parchment paper or nonstick cooking spray
3. Medium and small mixing bowls
4. Whisk
5. Electric hand mixer or sturdy wooden spoon for beating
6. Rubber spatula for scraping and smoothing
7. Dry sifter or fine mesh sieve for cocoa and flour
8. Measuring cups and measuring spoons
9. Wire cooling rack
10. Toothpick or cake tester for doneness

FAQ

Q: What oven temperature and baking time should I use for the brownies? A: Bake in a 350°F (175°C) oven for 20 to 25 minutes, or until a toothpick inserted near the center comes out with a few moist crumbs but not wet batter.

Q: Can I use regular chocolate chips instead of mini colorful candies? A: Yes. Use about 1/2 to 3/4 cup of mini chocolate chips or chopped chocolate, and press some on top after frosting so they stick and create a similar texture.

Q: How do I get the frosting to the right consistency? A: Start with 2 tablespoons of milk and add up to 1 more tablespoon a little at a time until the frosting spreads smoothly but is not runny. If too thin, add a teaspoon of powdered sugar at a time to thicken.

Q: Can I make these gluten free? A: Yes. Substitute the all purpose flour with a 1:1 gluten free baking flour blend and ensure the blend contains xanthan gum or add 1/4 teaspoon xanthan gum for better texture. Results may be slightly crumblier.

Q: How should I store the brownies and how long do they keep? A: Store in an airtight container at room temperature for up to 3 days. For up to 1 week, refrigerate. Bring to room temperature before serving for best texture.

Q: Can I freeze the brownies or the unfrosted brownie layer? A: Yes. Freeze individual frosted brownies on a sheet, then transfer to a sealed container with parchment between layers for up to 3 months. You can also freeze the unfrosted baked slab wrapped tightly, then thaw and frost when ready.

Copycat Cosmic Brownies Recipe Substitutions and Variations

Unsalted butter: substitute with equal amount coconut oil (solid at room temp gives similar texture) or light olive oil (use 3 tablespoons oil for each 1/4 cup butter and expect slightly different flavor)
Large eggs: use two flax eggs (2 tbsp ground flaxseed mixed with 6 tbsp water, let sit 5 minutes) or 1/2 cup unsweetened applesauce (will yield a moister, slightly denser brownie)
All purpose flour: swap for 1:1 gluten free baking blend (use same volume) or for a lower-carb option try 1:1 almond flour (may produce a more crumbly, tender crumb)
Granulated sugar: replace with light brown sugar (adds moisture and a caramel note) or coconut sugar (use equal parts; flavor is deeper and slightly less sweet)

Pro Tips

1. Use room temperature eggs and add them one at a time while whisking; this helps the batter emulsify smoothly so your brownies are fudgy rather than cakey.

2. Sift the cocoa and powdered sugar right before using to avoid lumps in both batter and frosting. If your frosting feels too stiff, heat the milk slightly and add it a teaspoon at a time until it spreads easily.

3. Don’t overbake. Start checking at 18 minutes and remove when a few moist crumbs cling to the toothpick. The brownies will continue to set as they cool, so err on the side of slightly underdone for a chewy center.

4. Press the mini candies in gently after spreading the frosting, then chill the pan to set. Chilling makes cleaner cuts and keeps the candy shells from cracking when you slice.

Copycat Cosmic Brownies Recipe

Recipe by Tina Bueller

0.0 from 0 votes

I packed these Copycat Cosmic Brownies with dense, fudgy chocolate and that iconic rainbow candy crunch. One bite and I’m right back to the lunchbox treat everyone wanted to trade for.

Servings

servings

Calories

312

kcal

Equipment: 1. 8×8 inch baking pan (lined with parchment or greased)
2. Parchment paper or nonstick cooking spray
3. Medium and small mixing bowls
4. Whisk
5. Electric hand mixer or sturdy wooden spoon for beating
6. Rubber spatula for scraping and smoothing
7. Dry sifter or fine mesh sieve for cocoa and flour
8. Measuring cups and measuring spoons
9. Wire cooling rack
10. Toothpick or cake tester for doneness

Ingredients

1/2 cup (1 stick) unsalted butter, melted
1 cup granulated sugar
2 large eggs, room temperature
1 teaspoon vanilla extract
1/3 cup unsweetened cocoa powder, sifted
1/2 cup all purpose flour
1/4 teaspoon salt
1/4 teaspoon baking powder
2 cups powdered sugar
1/4 cup unsweetened cocoa powder for frosting
2 tablespoons unsalted butter, melted for frosting
2 to 3 tablespoons milk for frosting
1 teaspoon vanilla extract for frosting
1/2 to 3/4 cup mini colorful chocolate candies (M&M style) for topping

Directions

Preheat oven to 350 F and line an 8×8 inch baking pan with parchment paper or grease the pan.
In a medium bowl whisk together 1/2 cup melted unsalted butter and 1 cup granulated sugar until smooth.
Add 2 room temperature eggs and 1 teaspoon vanilla extract to the butter mixture and beat until fully combined.
Sift 1/3 cup unsweetened cocoa powder into the wet ingredients, then stir in 1/2 cup all purpose flour, 1/4 teaspoon salt, and 1/4 teaspoon baking powder until just combined and glossy batter forms.
Pour the batter into the prepared pan, smooth the top, and bake 20 to 25 minutes until a toothpick inserted near the center comes out with a few moist crumbs but not raw batter.
Let the brownies cool completely in the pan on a wire rack while you make the frosting.
For the frosting combine 2 cups powdered sugar, 1/4 cup unsweetened cocoa powder, 2 tablespoons melted unsalted butter, 2 to 3 tablespoons milk, and 1 teaspoon vanilla extract; stir until a thick, spreadable frosting forms, adding milk a little at a time to reach desired consistency.
Spread the chocolate frosting evenly over the cooled brownies.
Immediately sprinkle 1/2 to 3/4 cup mini colorful chocolate candies over the frosting, press gently so they adhere, then chill the pan for at least 30 minutes to set before cutting into squares.

Notes

Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.