Black Cocoa Cake

Why You’ll Love This Recipe

I love how intensely chocolatey this cake tastes without being overly sweet. The black cocoa gives it a striking appearance and a unique flavor that reminds me of chocolate sandwich cookies.

I also appreciate how moist the crumb stays thanks to the sour cream, oil, and hot coffee. The mascarpone frosting is light and fluffy, making it the perfect complement to the rich cake layers.

Ingredients

(Here’s a tip: Check out the full list of ingredients and measurements in the recipe card below.)

For the Black Cocoa Cake

• 240 grams cake flour
• 80 grams black cocoa powder
• 1/2 tsp fine sea salt
• 1 tbsp baking powder
• 350 grams granulated sugar
• 160 mL canola oil or neutral oil
• 2 large eggs, room temperature
• 150 grams sour cream
• 240 mL hot coffee
• 60 mL espresso, cooled (optional for soaking)

For the Mascarpone Frosting

• 113 grams mascarpone, cold
• 60 grams powdered sugar
• 1/2 Tbsp vanilla bean paste
• 180 mL heavy whipping cream, cold
• 60 mL espresso, cooled (optional)

For Garnish

• Cocoa powder for dusting

Directions

1. I preheat the oven to 350°F and grease and line two 8-inch cake pans with parchment paper.
2. In a large bowl, I whisk together the cake flour, black cocoa powder, baking powder, and salt until evenly combined.
3. In a separate bowl, I whisk the sugar, oil, eggs, and sour cream until smooth.
4. I sift the dry ingredients over the wet ingredients and whisk gently until partially combined.
5. I pour in the hot coffee and continue whisking until the batter becomes smooth and fully incorporated.
6. I scrape down the sides of the bowl, give everything a final mix, and divide the batter between the prepared pans.
7. I bake for about 25 minutes, or until the center springs back lightly when touched.
8. I allow the cakes to cool in the pans for 10 minutes before turning them out onto a towel. I let them cool completely before assembling.
9. If I want extra coffee flavor, I trim the tops and drizzle the cooled espresso over the cake layers.
10. For the frosting, I beat the cold mascarpone and powdered sugar until smooth.
11. I add the vanilla bean paste and mix on medium speed.
12. I slowly stream in the cold heavy cream in several additions, scraping the bowl as needed.
13. Once all the cream is incorporated, I increase the speed until the frosting thickens and holds soft peaks.
14. If using espresso in the frosting, I slowly add it while mixing just until combined.
15. I spread the mascarpone frosting over the cooled cake and finish with a generous dusting of cocoa powder.

Servings and timing

• Servings: 16
• Prep Time: 20 minutes
• Bake Time: 25 minutes
• Cooling Time: 1 hour 10 minutes
• Total Time: 1 hour 55 minutes

Variations

I sometimes add a layer of chocolate ganache between the cake layers for an even richer dessert.

I enjoy replacing the espresso soak with coffee liqueur when serving the cake at adult gatherings.

I occasionally add chocolate curls or shaved dark chocolate on top for a more decorative presentation.

I like using vanilla extract instead of vanilla bean paste when I want a simpler version.

I sometimes turn this recipe into cupcakes for individual servings and easier entertaining.

Storage/Reheating

I store the finished cake covered in the refrigerator for up to 4 days because of the mascarpone frosting.

I let slices sit at room temperature for about 20 minutes before serving so the cake softens and the flavors become more pronounced.

For longer storage, I freeze individual slices in airtight containers for up to 2 months. I thaw them overnight in the refrigerator before serving.

Since this cake is best enjoyed chilled or at room temperature, I do not reheat it.

FAQs

What is black cocoa powder?

Black cocoa powder is an ultra-Dutch-processed cocoa with a very dark color and smooth chocolate flavor. I love using it because it gives the cake its dramatic appearance and distinctive taste.

Can I make this cake without coffee?

Yes. I can substitute hot water for the coffee, although I find that coffee enhances the chocolate flavor without making the cake taste like coffee.

Why is my mascarpone frosting too soft?

The frosting can become soft if the ingredients are too warm. I always use cold mascarpone and cold heavy cream to help it whip properly.

Can I make the cake layers ahead of time?

Yes. I often bake the cake layers a day ahead and store them tightly wrapped until I am ready to frost and serve.

Can I use a different frosting?

Absolutely. I enjoy pairing this cake with chocolate buttercream, whipped cream frosting, or classic cream cheese frosting when I want a different flavor profile.

Conclusion

I love this black cocoa cake because it delivers an intense chocolate experience with surprisingly simple ingredients. The moist cake, optional espresso soak, and airy mascarpone frosting create a beautiful balance of richness and elegance. Whether I serve it for birthdays, celebrations, or simply alongside a cup of coffee, it always feels like a truly special dessert.