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
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
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
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
Prepare Eggs
If eggs are cold, place them in a bowl of lukewarm water for about 15 minutes to reach room temperature.
Time: PT15M
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
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
Mix Wet and Dry
Gradually add the dry mixture to the wet batter, stirring gently until just combined. Avoid over‑mixing.
Time: PT3M
Prepare Baking Pan
Line a 13×9‑inch baking pan with parchment paper (or lightly grease the pan).
Time: PT2M
Transfer Batter
Pour the batter into the prepared pan and spread evenly with a spatula.
Time: PT2M
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
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
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
Cool Brownies Slightly
Allow the baked brownies to sit in the pan for 5 minutes before frosting.
Time: PT5M
Spread Ganache
Pour the cooled ganache over the brownies and spread evenly with a spatula.
Time: PT3M
Add Candy Coated Chips
Sprinkle 2 tbsp of colorful candy‑coated chips over the ganache for the signature Cosmic Brownie look.
Time: PT2M
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






