This Childhood Favorite is Simple to Make at Home: Cosmic Brownies

This Childhood Favorite is Simple to Make at Home: Cosmic Brownies is a medium American recipe that serves 12. 250 calories per serving. Recipe by Sugar Spun Run on YouTube.

Prep: 15 min | Cook: 24 min | Total: 49 min

Cost: $40.69 total, $3.39 per serving

Ingredients

  • 12 tablespoons Unsalted Butter (cut into tablespoon‑sized pieces)
  • 0.75 cup Natural Cocoa Powder (non‑Dutch processed, unsweetened)
  • 1 cup Granulated Sugar
  • 0.5 cup Light Brown Sugar (firmly packed)
  • 2 Large Eggs (room temperature; plus 1 extra yolk)
  • 1 teaspoon Vanilla Extract (pure vanilla extract)
  • 1.25 cup All-Purpose Flour (sifted)
  • 1 teaspoon Corn Starch (optional, adds tenderness)
  • 0.5 teaspoon Salt (fine sea salt)
  • 1 cup Semi-Sweet Chocolate Chips (for ganache)
  • 0.5 cup Milk Chocolate Chips (for ganache)
  • 0.33 cup Heavy Cream
  • 0.125 teaspoon Salt (pinch for ganache)
  • 2 tablespoons Candy Coated Chips (colorful topping, optional)

Instructions

  1. Melt Butter

    Cut the 12 tbsp of unsalted butter into tablespoon‑sized pieces, place in a large mixing bowl and microwave on high, stirring halfway through to prevent splatter, until about 95% melted.

    Time: PT5M

  2. Bloom Cocoa

    Add 3/4 cup natural cocoa powder to the hot butter and stir until fully incorporated; the heat helps bloom the cocoa for deeper flavor.

    Time: PT2M

  3. Incorporate Sugars

    Stir in 1 cup granulated sugar and 1/2 cup firmly packed light brown sugar until the mixture is glossy and the sugars are dissolved.

    Time: PT2M

  4. Prepare Eggs

    If eggs are cold, place them in a bowl of lukewarm water for about 15 minutes to reach room temperature.

    Time: PT15M

  5. Add Eggs and Vanilla

    Separate one egg yolk from the two whole eggs, discard or reserve the whites, then add the two eggs, the extra yolk, and 1 tsp pure vanilla extract to the chocolate mixture. Mix until smooth.

    Time: PT2M

  6. Combine Dry Ingredients

    In a medium mixing bowl, whisk together 1 ¼ cups all‑purpose flour, 1 tsp corn starch, and ½ tsp salt until evenly blended.

    Time: PT3M

  7. Mix Wet and Dry

    Gradually add the dry mixture to the wet batter, stirring gently until just combined. Avoid over‑mixing.

    Time: PT3M

  8. Prepare Baking Pan

    Line a 13×9‑inch baking pan with parchment paper (or lightly grease the pan).

    Time: PT2M

  9. Transfer Batter

    Pour the batter into the prepared pan and spread evenly with a spatula.

    Time: PT2M

  10. Bake Brownies

    Bake in the center rack of a preheated 350°F oven for 16‑18 minutes. Test with a toothpick; it should come out clean or with a few fudgy crumbs.

    Time: PT17M

    Temperature: 350°F

  11. Make Ganache

    While brownies bake, combine 1 cup semi‑sweet chocolate chips, ½ cup milk chocolate chips, 1/3 cup heavy cream, and a pinch (1/8 tsp) salt in a medium saucepan over low heat. Stir constantly with a spatula until smooth and fully melted.

    Time: PT5M

  12. Finish Ganache

    Remove the saucepan from heat, stir in 1 tsp pure vanilla extract, and let the ganache cool for about 5 minutes until it thickens slightly.

    Time: PT5M

  13. Cool Brownies Slightly

    Allow the baked brownies to sit in the pan for 5 minutes before frosting.

    Time: PT5M

  14. Spread Ganache

    Pour the cooled ganache over the brownies and spread evenly with a spatula.

    Time: PT3M

  15. Add Candy Coated Chips

    Sprinkle 2 tbsp of colorful candy‑coated chips over the ganache for the signature Cosmic Brownie look.

    Time: PT2M

  16. Set and Serve

    Let the brownies set for at least 30 minutes (or refrigerate for faster firming) before cutting into squares.

    Time: PT30M

Nutrition Facts

Calories
250
Protein
3g
Carbohydrates
30g
Fat
14g
Fiber
2g

Dietary info: Vegetarian

Allergens: Dairy, Eggs, Gluten

Last updated: April 18, 2026

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This Childhood Favorite is Simple to Make at Home: Cosmic Brownies

Recipe by Sugar Spun Run

A nostalgic, thin and fudgy brownie inspired by the classic store‑bought Cosmic Brownies. Made with a rich chocolate‑cocoa base, a buttery ganache topping, and colorful candy‑coated chips for that signature look.

MediumAmericanServes 12

Shop all ingredients on Amazon in one click • Printable PDF with shopping checklist

Source Video
1h 16m
Prep
27m
Cook
12m
Cleanup
1h 55m
Total

Cost Breakdown

$40.69
Total cost
$3.39
Per serving

Critical Success Points

  • Melt butter without splattering in the microwave.
  • Bloom cocoa powder in hot butter for deep chocolate flavor.
  • Do not over‑bake; use the toothpick test for fudgy doneness.
  • Heat ganache slowly over low heat to avoid seizing.
  • Allow ganache to cool slightly before spreading to prevent runoff.

Safety Warnings

  • Butter and ganache are very hot; handle with care to avoid burns.
  • Use oven mitts when removing the pan from the oven.
  • Stir ganache constantly to prevent chocolate from scorching.

Frequently Asked Questions

Everything you need to know about this recipe

Q

What is the cultural significance and history of Cosmic Brownies in American snack culture?

A

Cosmic Brownies are a nostalgic, pre‑packaged snack that became popular in the 1990s and early 2000s, often associated with school lunches and birthday parties. Their bright candy‑coated topping and fudgy interior made them a beloved treat for kids and adults alike.

cultural
Q

What are the traditional regional variations of Cosmic Brownies in the United States?

A

While the classic version is a thin, chocolate‑fudgy brownie with colorful candy chips, some regional bakeries add peanut butter swirls or use different candy toppings like sprinkles. The core concept—thin brownie with a glossy chocolate coating—remains the same.

cultural
Q

How are authentic Cosmic Brownies traditionally served in American households?

A

They are usually served at room temperature, cut into bite‑size squares, and enjoyed as a snack or dessert. Many families serve them with a glass of milk or a scoop of vanilla ice cream for extra indulgence.

cultural
Q

What occasions or celebrations are Cosmic Brownies traditionally associated with in American culture?

A

Cosmic Brownies are a popular treat for Valentine's Day, birthday parties, school events, and casual get‑togethers because of their fun appearance and nostalgic appeal.

cultural
Q

What authentic traditional ingredients are used in Cosmic Brownies versus acceptable substitutes?

A

The authentic recipe uses natural (non‑Dutch) cocoa powder, semi‑sweet and milk chocolate chips, and candy‑coated chips. Acceptable substitutes include Dutch‑processed cocoa (though flavor changes), dark chocolate chips, or regular sprinkles instead of candy‑coated chips.

cultural
Q

What other American desserts pair well with Cosmic Brownies?

A

Cosmic Brownies pair nicely with vanilla ice cream, whipped cream, or a drizzle of caramel sauce. They also complement other retro snacks like Zebra Cakes or Fun‑Size candy bars for a nostalgic dessert platter.

cultural
Q

What are the most common mistakes to avoid when making Cosmic Brownies at home?

A

Common mistakes include over‑baking the brownies, overheating the ganache (which causes seizing), and using cold eggs that can curdle the batter. Following the timing and temperature guidelines prevents these issues.

technical
Q

Why does this Cosmic Brownies recipe use an extra egg yolk instead of a whole egg?

A

The extra yolk adds extra fat and emulsifiers, giving the brownies a richer, more tender and fudgy texture while keeping them from becoming too cakey.

technical
Q

Can I make Cosmic Brownies ahead of time and how should I store them?

A

Yes, bake the brownies, let them cool, then spread the ganache and refrigerate. Store in an airtight container in the refrigerator for up to 5 days or freeze for up to 2 months. Bring to room temperature before serving.

technical
Q

What texture and appearance should I look for when making Cosmic Brownies?

A

The brownies should be thin, glossy, and slightly crackly on top with a fudgy interior. The ganache topping should be smooth, glossy, and just warm enough to spread, and the candy‑coated chips should sit on top without melting into the ganache.

technical
Q

How do I know when the Cosmic Brownies are done cooking?

A

Insert a toothpick into the center; it should come out clean or with a few moist, fudgy crumbs. The edges will look set, and the surface will have a slight sheen.

technical
Q

What does the YouTube channel Sugar Spun Run specialize in?

A

The YouTube channel Sugar Spun Run, hosted by Sam, specializes in fun, nostalgic dessert recreations and approachable home‑baking tutorials with a focus on sweet treats that evoke childhood memories.

channel
Q

How does the YouTube channel Sugar Spun Run's approach to American nostalgic desserts differ from other cooking channels?

A

Sugar Spun Run blends personal storytelling with step‑by‑step instructions, often adding practical tips like room‑temperature eggs and microwave butter melting, whereas many channels focus solely on technique without the nostalgic context.

channel
Q

What other American nostalgic recipes is the YouTube channel Sugar Spun Run known for?

A

Sugar Spun Run is also known for recreating classic snacks such as Zebra Cakes, Fun‑Size candy bars, and homemade versions of popular store‑bought desserts like Twinkies and Pop‑Tarts.

channel

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