cosmic brownies
cosmic brownies is a medium American recipe that serves 12. 250 calories per serving. Recipe by Tim Laielli on YouTube.
Prep: 30 min | Cook: 25 min | Total: 3 hrs 10 min
Cost: $14.46 total, $1.20 per serving
Ingredients
- 1 cup Unsalted Butter (for brownie batter, melted)
- 2 cups Semi-Sweet Chocolate Chips (1 cup for batter, 1 cup for ganache)
- 1.5 cups Granulated Sugar (adds sweetness and helps texture)
- 0.5 cup Brown Sugar (packed, adds moisture)
- 3 Large Eggs (room temperature)
- 1 tsp Vanilla Extract (pure vanilla)
- 0.75 cup All-Purpose Flour (sifted)
- 0.5 cup Unsweetened Cocoa Powder (high‑quality Dutch‑process)
- 0.25 tsp Baking Powder
- 0.25 tsp Salt
- 0.75 cup Heavy Cream (for ganache, full‑fat)
- 2 tbsp Unsalted Butter (for ganache) (cut into small pieces)
- 0.25 cup Rainbow Sprinkles (for topping, the exact sprinkles used in the original Cosmic Brownies)
Instructions
Preheat Oven & Prepare Pan
Preheat the oven to 350°F (175°C). Line a 9×13‑inch baking pan with parchment paper, leaving an overhang on the sides for easy removal.
Time: PT5M
Temperature: 350°F
Melt Butter and Chocolate
Place 1 cup butter and 1 cup chocolate chips in a heatproof bowl over a saucepan of simmering water (double boiler). Stir constantly until completely smooth and glossy.
Time: PT5M
Combine Sugars, Eggs, and Vanilla
In a large mixing bowl, whisk together granulated sugar, brown sugar, eggs, and vanilla extract until the mixture lightens slightly and is well‑combined.
Time: PT5M
Incorporate Melted Chocolate
Pour the melted butter‑chocolate mixture into the sugar‑egg bowl. Stir gently until fully incorporated; the batter will be thick.
Time: PT3M
Fold in Dry Ingredients
Sift together flour, cocoa powder, baking powder, and salt. Gently fold the dry mixture into the batter using a spatula until just combined—do not over‑mix.
Time: PT5M
Bake the Brownies
Spread the batter evenly in the prepared pan. Bake for 25 minutes, or until the top looks set and a toothpick inserted in the center comes out with a few moist crumbs.
Time: PT25M
Temperature: 350°F
Cool Slightly
Remove the pan from the oven and let the brownies cool on a rack for about 15 minutes. This makes them sturdy enough to handle the ganache.
Time: PT15M
Prepare Chocolate Ganache
In a saucepan, bring the heavy cream to a gentle simmer (just before it starts to boil). Remove from heat and pour over 1 cup chocolate chips in a heatproof bowl. Let sit 2 minutes, then stir until smooth. Add the 2 tbsp butter and continue stirring until the ganache is glossy and fully incorporated.
Time: PT10M
Frost and Sprinkle
Spread the warm ganache evenly over the cooled brownies using a spatula. Immediately sprinkle the rainbow sprinkles over the top, covering the surface.
Time: PT5M
Chill to Set
Place the frosted brownies in the refrigerator for at least 2 hours (or until the ganache is firm).
Time: PT2H
Cut and Serve
Lift the brownies out of the pan using the parchment overhang. Transfer to a cutting board and cut into 12 even squares.
Time: PT5M
Nutrition Facts
- Calories
- 250
- Protein
- 3 g
- Carbohydrates
- 30 g
- Fat
- 12 g
- Fiber
- 2 g
Dietary info: Vegetarian
Allergens: Dairy, Eggs, Gluten
Ingredient Substitutions
- Instead of Unsalted Butter: Margarine, Coconut oil
- Instead of Semi-Sweet Chocolate Chips: Dark chocolate chunks, Milk chocolate chips
- Instead of Granulated Sugar: Coconut sugar, Caster sugar
- Instead of Brown Sugar: Light brown sugar, Turbinado sugar
- Instead of Large Eggs: Egg replacer, Flax egg (2 tbsp flaxseed + 6 tbsp water)
- Instead of Vanilla Extract: Maple extract, Almond extract (use half amount)
- Instead of All-Purpose Flour: Gluten‑free flour blend, Cake flour (use 1 cup)
- Instead of Unsweetened Cocoa Powder: Natural cocoa powder, Carob powder
- Instead of Baking Powder: Baking soda (use half amount)
- Instead of Salt: Sea salt, Kosher salt
- Instead of Heavy Cream: Half‑and‑half (use 1 cup), Coconut cream
- Instead of Unsalted Butter (for ganache): Margarine, Coconut oil
- Instead of Rainbow Sprinkles: Chocolate non‑pareils, Colored sugar crystals
Equipment Needed
- Mixing Bowl
- Whisk
- Saucepan
- Heatproof Bowl (for double boiler)
- Spatula
- 9×13‑inch Baking Pan
- Parchment Paper (optional)
- Cooling Rack (optional)
- Knife
Critical Steps — Do Not Skip
- Melt butter and chocolate together over gentle steam to avoid scorching.
- Do not over‑mix the batter after adding flour; keep it dense and fudgy.
- Bake just until set; over‑baking creates a cakey texture.
- Make ganache over simmering cream and stir until glossy.
- Chill the frosted brownies long enough for the ganache to firm.
Chef Tips from the Video
- Use high‑quality dark chocolate chips for a richer ganache flavor.
- For an extra glossy finish, add a pinch of sea salt to the ganache.
- If you want the classic Cosmic Brownies look, press the sprinkles gently into the ganache with the back of a spoon.
Troubleshooting
Ganache looks grainy or separates.
Return the mixture to low heat and whisk vigorously; add a splash of warm cream if needed.
Brownies are dry or cakey.
Do not over‑bake; reduce oven time by 2‑3 minutes and ensure the batter is not over‑mixed.
Sprinkles melt into the ganache.
Apply sprinkles while the ganache is still warm but not hot, and chill immediately after topping.
Storage
Refrigerator: Store in an airtight container for up to 5 days.
Freezer: Wrap tightly in plastic wrap and foil; freeze up to 2 months. Thaw in fridge before serving.
Room temperature: Only for a few hours; ganache will soften.
Make-Ahead Tips
- Bake the brownies a day ahead and keep them uncovered at room temperature; add ganache just before serving.
- Ganache can be made up to 24 hours in advance and stored in the fridge; re‑warm gently before spreading.
Frequently Asked Questions
What is the cultural significance and history of Cosmic Brownies in American snack culture?
Cosmic Brownies originated in the 1990s as a popular school‑yard treat, known for their dense, fudgy texture and bright sprinkles that made them easy to trade at lunch. They became a nostalgic icon of childhood snack hierarchies, symbolizing status on the cafeteria table.
What are the traditional regional variations of dense fudgy brownies in the United States?
While the classic brownie is found nationwide, some regions add ingredients like peanut butter, caramel swirls, or extra chocolate chips. The Cosmic Brownie variation is distinguished by its extra‑dense crumb and a thick chocolate ganache topping with colorful sprinkles.
How is the authentic Cosmic Brownie traditionally served in American school lunchrooms?
Traditionally, a single square is wrapped in wax paper or placed in a small lunchbox, allowing kids to trade it for other snacks. The brownies are served at room temperature or slightly chilled, with the ganache firm enough to hold the sprinkles without smearing.
What occasions or celebrations are Cosmic Brownies traditionally associated with in American culture?
Cosmic Brownies are popular at birthday parties, school fundraisers, and casual get‑togethers where a portable, shareable dessert is desired. Their bright sprinkles also make them a fun addition to holiday snack tables.
What makes Cosmic Brownies special or unique in American dessert cuisine?
Their hallmark is an ultra‑dense, almost fudge‑like crumb paired with a thick chocolate ganache that stays firm, plus the iconic rainbow sprinkles that give them a playful, eye‑catching look. This combination sets them apart from regular brownies.
What are the most common mistakes to avoid when making Cosmic Brownies at home?
Common errors include over‑mixing the batter, which creates a cakey texture, over‑baking, which dries the brownies, and overheating the ganache, which can cause it to separate. Follow the critical steps for melting chocolate and chilling the ganache.
Why does this Cosmic Brownies recipe use a double‑boiler for the chocolate ganache instead of a microwave?
A double‑boiler provides gentle, even heat that prevents the chocolate from scorching or seizing, resulting in a smooth, glossy ganache. Microwaving can create hot spots that lead to grainy texture.
Can I make Cosmic Brownies ahead of time and how should I store them?
Yes. Bake the brownies up to 24 hours ahead, keep them covered at room temperature, then add the ganache and sprinkles just before serving. Store any leftovers in an airtight container in the refrigerator for up to five days.
What texture and appearance should I look for when the ganache is done?
The ganache should be smooth, glossy, and thick enough to coat the back of a spoon without dripping. When it cools slightly, it should set to a soft sheen that holds the sprinkles in place.
How do I know when the Cosmic Brownies are done baking?
The edges will look set and the top will have a matte finish. Insert a toothpick into the center; it should come out with a few moist crumbs but no wet batter. The brownies will continue to firm as they cool.
What does the YouTube channel Tim Laielli specialize in?
The YouTube channel Tim Laielli focuses on nostalgic snack recreations, quick comfort food recipes, and playful kitchen experiments that blend humor with practical cooking tips.
How does the YouTube channel Tim Laielli's approach to American snack recipes differ from other cooking channels?
Tim Laielli combines personal storytelling with step‑by‑step demonstrations, often highlighting the cultural backstory of classic snacks like Cosmic Brownies, whereas many other channels focus solely on technique without the nostalgic context.
Last updated: September 1, 2026
