I made these homemade cosmic brownies ultra-fudgy, rich, and topped with glossy chocolate ganache plus those classic candy-coated chips. One bite and the lunchbox favorite suddenly feels like it got a serious chocolate upgrade.

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I’m obsessed with these homemade cosmic brownies because they hit that fudgy, glossy, chocolate-loaded craving without tasting like a sad lunchbox throwback. The brownie base is dense in the best way, thanks to unsweetened cocoa powder, and the thick ganache on top makes every bite feel ridiculous.

But the candy coated chocolate pieces? That’s the part I secretly look forward to most.

Crunchy, colorful, totally nostalgic. I love that these taste richer and bolder than the store-bought ones, but still keep that fun cosmic brownie vibe.

And yes, I absolutely cut myself a corner piece first. Every single time.

Ingredients

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Melted butter makes these brownies rich, fudgy, and a little dangerously good.
Sugar brings that classic chewy top and sweet lunchbox brownie vibe.
Eggs hold everything together and give the center that dense bite.
Vanilla adds warmth, so the chocolate doesn’t taste flat.
Flour keeps them brownie-shaped, not chocolate lava in a pan.
Cocoa powder brings the deep chocolate flavor you’re actually here for.
Baking powder gives a tiny lift, but these still stay fudgy.
Salt cuts the sweetness and makes the chocolate pop.
Don’t skip it.
Semi-sweet chocolate makes the ganache glossy, thick, and totally snackable.
Heavy cream turns chocolate into that smooth frosting-like layer.
Candy-coated chocolates add crunch, color, and the fun cosmic brownie look.
Plus, they’re not healthy, but they’re absolutely worth the sticky fingers.

Ingredient Quantities

1 cup unsalted butter (226 g), melted

2 cups granulated sugar (400 g)

4 large eggs, room temperature

1 tablespoon vanilla extract

1 cup all purpose flour (120 g)

3/4 cup unsweetened cocoa powder (75 g), sifted

1/2 teaspoon baking powder

1/2 teaspoon fine salt

8 ounces semi sweet chocolate, chopped or chips (225 g) for the ganache

2/3 cup heavy cream (160 ml) for the ganache

1 to 1 1/4 cups candy coated chocolate pieces (such as M&M) for topping

How to Make this

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1. Preheat oven to 350°F (175°C). Line a 9×13 inch baking pan with parchment paper leaving an overhang for easy removal and set aside.

2. In a large bowl whisk melted unsalted butter and granulated sugar until combined and glossy.

3. Add the eggs one at a time, whisking well after each addition, then stir in vanilla extract.

4. Sift the unsweetened cocoa powder into the wet mixture, then add the all purpose flour, baking powder, and fine salt. Fold gently until just combined and no streaks of flour remain.

5. Spread the batter evenly into the prepared pan, smoothing the top with an offset spatula.

6. Bake 20 to 25 minutes or until the edges are set and a toothpick inserted near the center comes out with a few moist crumbs. Do not overbake to keep brownies ultra fudgy.

7. Let the brownies cool in the pan while you make the ganache. Place the chopped semi sweet chocolate in a heatproof bowl. Heat the heavy cream until it just begins to simmer, then pour it over the chocolate and let sit 1 to 2 minutes. Stir until smooth and glossy.

8. Pour the ganache over the cooled brownie layer and spread evenly with a spatula.

9. Immediately sprinkle 1 to 1 1 1/4 cups candy coated chocolate pieces over the ganache and press gently so they adhere.

10. Chill until ganache is set, about 30 to 60 minutes, then lift the brownies from the pan using the parchment overhang and cut into squares. Serve at room temperature.

Equipment Needed

1. 9×13 inch baking pan
2. Parchment paper
3. Large mixing bowl
4. Whisk
5. Rubber spatula and offset spatula
6. Measuring cups and spoons
7. Heatproof bowl and small saucepan for heating cream
8. Knife and cutting board for chopping chocolate
9. Toothpick or cake tester

FAQ

1 cup unsalted butter (226 g), melted

2 cups granulated sugar (400 g)

4 large eggs, room temperature

1 tablespoon vanilla extract

1 cup all purpose flour (120 g)

3/4 cup unsweetened cocoa powder (75 g), sifted

1/2 teaspoon baking powder

1/2 teaspoon fine salt

8 ounces semi sweet chocolate, chopped or chips (225 g) for the ganache

2/3 cup heavy cream (160 ml) for the ganache

1 to 1 1/4 cups candy coated chocolate pieces (such as M&M) for topping

Q: Can I substitute the heavy cream in the ganache? A: Yes. Use equal parts half and half for a slightly lighter ganache or use a dairy free cream substitute for a dairy free option, but texture will be a bit different.

Q: Can I make the brownies ahead of time? A: Yes. Bake and cool the brownies, then cover and refrigerate for up to 3 days before adding ganache and candy. You can also freeze baked, uncut brownies for up to 2 months. Thaw completely, then add ganache and toppings.

Q: How can I tell when the brownies are done? A: Look for a set top and edges that have pulled slightly from the pan. A toothpick should come out with moist crumbs but not wet batter. They will continue to set as they cool.

Q: Can I use dark chocolate or milk chocolate for the ganache? A: Yes. Use dark chocolate for a more intense chocolate flavor or milk chocolate for a sweeter, creamier ganache. Adjust sweetness to taste.

Q: Can I add nuts or other mix ins? A: Absolutely. Fold chopped nuts, chocolate chunks, or even a swirl of caramel into the batter before baking. Reserve candy topping for after the ganache for the best look.

Q: What pan size should I use if I do not have an 8×8 pan? A: An 9×9 inch pan will work but the brownies will be slightly thinner and bake a few minutes less. For a deeper brownie use a 7×11 inch pan and check baking time carefully.

Delicious Homemade Cosmic Brownies Recipe Substitutions and Variations

Unsalted butter (1 cup): substitute equal weight of melted coconut oil for a subtle coconut note or melted neutral vegetable shortening for dairy free texture.
All purpose flour (1 cup): swap with a 1-to-1 gluten free flour blend (look for one with xanthan gum included) for gluten free brownies.
4 large eggs: use 4 flax “eggs” (4 tbsp ground flaxseed blended with 12 tbsp water, let sit 5 minutes) for an egg free binder, or 1 cup unsweetened applesauce to add moisture and reduce fat.
Heavy cream for ganache (2/3 cup): replace with full fat coconut milk (same volume) for a dairy free ganache or use evaporated milk in equal measure for a slightly lighter finish.

Pro Tips

1. Use room temperature eggs and add them one at a time so the batter emulsifies smoothly; that helps the brownies stay dense and fudgy instead of airy.
2. Watch the oven closely near the end of baking. Pull them when a toothpick shows a few moist crumbs in the center; a minute or two too long will dry them out.
3. Warm the cream until it barely simmers and let it sit on the chopped chocolate for a full minute before stirring. That resting step gives a silkier, shinier ganache with fewer streaks.
4. Press the candy pieces in gently while the ganache is still soft, then chill to set. Doing it too early lets colors bleed, doing it too late makes them fall off.
5. For cleaner slices, chill the whole pan until the ganache is firm, then run a sharp knife under hot water, wipe it dry, and slice. Repeat warming the knife between cuts for neat edges.

Delicious Homemade Cosmic Brownies Recipe

Recipe by Tina Bueller

0.0 from 0 votes

Servings

servings

Calories

553

kcal

Equipment: 1. 9×13 inch baking pan
2. Parchment paper
3. Large mixing bowl
4. Whisk
5. Rubber spatula and offset spatula
6. Measuring cups and spoons
7. Heatproof bowl and small saucepan for heating cream
8. Knife and cutting board for chopping chocolate
9. Toothpick or cake tester

Ingredients

1 cup unsalted butter (226 g), melted
2 cups granulated sugar (400 g)
4 large eggs, room temperature
1 tablespoon vanilla extract
1 cup all purpose flour (120 g)
3/4 cup unsweetened cocoa powder (75 g), sifted
1/2 teaspoon baking powder
1/2 teaspoon fine salt
8 ounces semi sweet chocolate, chopped or chips (225 g) for the ganache
2/3 cup heavy cream (160 ml) for the ganache
1 to 1 1/4 cups candy coated chocolate pieces (such as M&M) for topping

Directions

Preheat oven to 350°F (175°C). Line a 9×13 inch baking pan with parchment paper leaving an overhang for easy removal and set aside.
In a large bowl whisk melted unsalted butter and granulated sugar until combined and glossy.
Add the eggs one at a time, whisking well after each addition, then stir in vanilla extract.
Sift the unsweetened cocoa powder into the wet mixture, then add the all purpose flour, baking powder, and fine salt. Fold gently until just combined and no streaks of flour remain.
Spread the batter evenly into the prepared pan, smoothing the top with an offset spatula.
Bake 20 to 25 minutes or until the edges are set and a toothpick inserted near the center comes out with a few moist crumbs. Do not overbake to keep brownies ultra fudgy.
Let the brownies cool in the pan while you make the ganache. Place the chopped semi sweet chocolate in a heatproof bowl. Heat the heavy cream until it just begins to simmer, then pour it over the chocolate and let sit 1 to 2 minutes. Stir until smooth and glossy.
Pour the ganache over the cooled brownie layer and spread evenly with a spatula.
Immediately sprinkle 1 to 1 1 1/4 cups candy coated chocolate pieces over the ganache and press gently so they adhere.
Chill until ganache is set, about 30 to 60 minutes, then lift the brownies from the pan using the parchment overhang and cut into squares. Serve at room temperature.

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.