
Cosmic Brownie Cheesecake transforms childhood nostalgia into an elevated dessert experience with multiple layers of chocolate decadence. The foundation begins with a chewy, fudgy brownie crust that supports a silky chocolate cheesecake filling, all crowned with glossy chocolate ganache and signature rainbow candy chips. Each bite delivers the perfect balance of chewy brownie, creamy cheesecake, and the delightful crunch of colorful sprinkles that instantly reconnects you with those beloved packaged treats.
I created this recipe during a particularly dreary winter when I found myself craving childhood comfort foods. The first time I served it at my sister's birthday gathering, my brother-in-law actually stopped mid-conversation when he took his first bite. Three people immediately pulled out their phones to take pictures, and my usually reserved father asked for seconds before finishing his first slice. What surprised me most was how the colorful sprinkles transformed the mood of the entire table – suddenly everyone was sharing stories about their favorite childhood treats and forgotten lunchbox memories.
Chocolate Components
- Bittersweet chocolate: Creates perfect foundation for brownie crust without overwhelming sweetness. Look for bars with 60-70% cacao content for richest flavor profile.
- Semi-sweet chocolate: Provides ideal balance for cheesecake filling and ganache topping. Chips work perfectly but premium bar chocolate creates even smoother melting.
- Dutch-processed cocoa powder: Delivers deeper color and smoother chocolate flavor than natural cocoa. Its alkalized processing removes acidity that can interfere with creamy texture.
- Full-fat cream cheese: Forms backbone of cheesecake filling with necessary fat content for proper setting. Philadelphia brand consistently delivers reliable results for texture.
- Sour cream: Introduces subtle tanginess that balances chocolate richness while contributing to silky texture. Full-fat version provides best moisture retention.
- Rainbow candy chips: Complete the authentic cosmic brownie experience with their distinctive crunch and color. These can typically be found in baking aisles or specialty cake decorating sections.
Creation Process
- Begin with brownie base
- Melt bittersweet chocolate with butter using gentle microwave intervals, stirring frequently. Whip eggs, sugar, and vanilla until pale and notably increased in volume. Stream chocolate mixture into eggs while beating continuously. Fold dry ingredients carefully until just combined, maintaining brownie density.
- Prepare springform setup
- Pour brownie batter into parchment-lined springform pan, smoothing evenly. Bake until center remains slightly fudgy but edges are set. Allow partial cooling while preparing water bath for cheesecake environment.
- Craft chocolate filling
- Melt semi-sweet chocolate until completely smooth, allowing slight cooling. Beat room temperature cream cheese with sugar until completely smooth and fluffy. Incorporate melted chocolate, vanilla, cocoa powder and salt at low speed. Fold in sour cream until fully integrated. Add eggs individually, mixing minimally after each addition.
- Employ proper baking technique
- Pour cheesecake mixture over partially cooled brownie crust. Place springform pan on oven rack positioned directly above water bath. Bake until edges set but center retains slight jiggle. Turn off oven, crack door, and allow gradual cooling inside oven before room temperature rest.
- Create glossy ganache
- Heat heavy cream just until bubbles form around edges. Pour over waiting chocolate chips, allowing brief melting period before whisking. Apply gentle pressure when stirring to maintain smooth, glossy appearance without incorporating air bubbles.
- Apply finishing touches
- Release sides of springform pan after complete chilling. Spread cooled ganache across top surface, allowing slight drip around edges for visual appeal. Immediately apply rainbow chips while ganache remains tacky enough for adherence.

My grandmother always insisted that chocolate desserts should be served slightly below room temperature for optimal flavor development. When I first attempted this recipe, I made the mistake of rushing the chilling process and serving it cold from the refrigerator. The following day, I discovered that allowing the slices to sit for fifteen minutes before serving completely transformed the experience – the brownie softened perfectly, the cheesecake became silkier, and the flavors bloomed remarkably. Now I always warn guests to resist immediate cutting, promising the brief wait delivers substantial rewards. This patience has become my secret ingredient.
Serving Suggestions
Warm chocolate sauce drizzled over individual slices creates beautiful presentation and temperature contrast. Fresh raspberries alongside each serving provide bright acidity that balances rich chocolate elements. Consider offering coffee with hint of cinnamon which enhances chocolate depth throughout multiple layers.
Flavor Variations
Incorporate espresso powder into brownie base for coffee-chocolate experience that enhances overall chocolate intensity. Swap traditional cosmic chips with crushed Reese's Pieces for peanut butter flavor profile throughout colorful topping. Add thin layer of salted caramel between brownie and cheesecake layers for sweet-salty dimension.
Storage Success
Refrigerate covered cheesecake up to five days without quality decline. Remove candy topping before storage as colors may bleed into ganache surface. For longer preservation, freeze individual slices with parchment between each for easy single-serving thawing. Allow frozen slices fifteen minutes at room temperature after refrigerator thawing for optimal texture restoration.
The moment I realized this cheesecake had truly captured something special was during a neighborhood potluck when an elderly gentleman approached me privately. He explained that his late wife had always packed cosmic brownies in his lunch during their fifty years of marriage, and tasting this dessert brought tears to his eyes from the unexpected memory. Food connects us through time in remarkable ways – this isn't just chocolate on chocolate on chocolate (though that alone would be magnificent). It's childhood wonder translated into sophisticated form while maintaining that special magic that made us fall in love with those foil-wrapped treats so many years ago.

Frequently Asked Questions
- → Why do I need to use a water bath for this cheesecake?
- A water bath serves two important purposes: it prevents cracks by creating a humid environment in the oven, and it ensures gentle, even heating. This gentle cooking method is essential for achieving that perfectly smooth, creamy texture that makes cheesecakes so luxurious. Without a water bath, your cheesecake is more likely to crack, rise unevenly, and have a drier texture.
- → Can I use regular cocoa powder instead of black cocoa for the brownie crust?
- Yes, you can use regular unsweetened cocoa powder for the entire recipe if you don't have black cocoa. The crust will be lighter in color but still delicious. For a closer match to the dark color of cosmic brownies, you could use Dutch-processed cocoa powder, which has a darker color and milder flavor than natural cocoa powder.
- → What candy-coated chocolate pieces work best for the topping?
- M&M's Minis work perfectly as they closely resemble the colorful chips on traditional cosmic brownies. You could also use regular M&M's chopped into smaller pieces, or Sixlets. For the most authentic look, choose candy pieces in bright rainbow colors (red, orange, yellow, green, blue) rather than seasonal or specialized color mixes.
- → Why did my ganache turn out grainy or separated?
- Ganache can become grainy if the chocolate gets too hot or if liquid is introduced too quickly. To prevent this, make sure your cream is just hot enough to melt the chocolate (not boiling), and let the chocolate and cream sit together for a few minutes before stirring. Start stirring from the center and move outward gradually. If your ganache does separate, try adding a splash of warm milk while whisking vigorously.
- → Can I freeze this cheesecake?
- Yes! This cheesecake freezes beautifully. Freeze the cheesecake (without the ganache and candy topping) by wrapping it tightly in plastic wrap and then aluminum foil. It will keep for up to 2 months. Thaw overnight in the refrigerator, then add the fresh ganache and candy toppings before serving for the best appearance and texture.