Go Back
+ servings
A rich slice of Dark Chocolate Truffle Cake showing layers of dark cake and cream filling, topped with chocolate ganache and hazelnut truffles.

Dark Chocolate Truffle Cake

This recipe creates a rich and decadent Dark Chocolate Truffle Cake, perfect for special occasions. It features moist chocolate cake layers, creamy milk chocolate buttercream, and a smooth dark chocolate ganache, all topped with chocolate truffles.
Prep Time 30 minutes
Cook Time 1 hour
Chilling Time 1 hour
Total Time 2 hours 30 minutes
Servings: 12 slices
Course: Dessert
Cuisine: American

Ingredients
  

For the Cake
  • 1 cup granulated sugar (200 grams)
  • 1 cup brown sugar (213 grams)
  • 1 3/4 cups unbleached all-purpose flour (210 grams)
  • 1 cup unsweetened natural cocoa powder (84 grams, not dutch process)
  • 1 1/2 teaspoons salt (9 grams)
  • 1 1/2 teaspoons baking powder (6 grams)
  • 1 1/2 teaspoons baking soda (4.5 grams)
  • 2 large eggs
  • 1 large egg yolk
  • 1/2 cup vegetable oil (100 grams)
  • 1 cup unsweetened, plain, full-fat greek yogurt (230 grams)
  • 2 teaspoons pure vanilla extract (9.3 grams)
  • 1 cup hot strong-brewed coffee (227 grams)
For Frosting and Decoration
  • 4 cups Milk Chocolate Buttercream
  • 1 cup Dark Chocolate Ganache
  • 1/2 cup ground nuts for decorating the bottom of the cake
  • As needed Chocolate truffles for decoration

Equipment

  • Oven
  • Two 8-inch round cake pans
  • Parchment paper
  • large bowl
  • Electric mixer
  • Spatula
  • Wire cooling racks
  • Cake board or serving platter
  • Icing spatula
  • Food processor
  • Double boiler

Method
 

  1. Preheat your oven to 325 degrees F (163 degrees C). Prepare two 8-inch round cake pans by coating them with vegetable shortening or butter. Line the bottom of each pan with parchment paper, press it down, and coat the paper with shortening or butter. Sprinkle flour inside the pans, shake to coat evenly, and tap out the excess.
  2. In a large bowl, combine the granulated sugar, brown sugar, flour, cocoa powder, salt, baking powder, and baking soda. Stir to mix.
  3. Add the eggs, egg yolk, vegetable oil, yogurt, and vanilla extract to the dry ingredients. Beat on low speed with an electric mixer until just blended, then increase speed to medium and beat for 2 minutes, scraping down the sides as needed.
  4. Reduce mixer speed to low. While the mixer is running, slowly pour in the hot coffee until blended. Stop the mixer, scrape down the sides, and stir to ensure the batter is well combined.
  5. Divide the batter evenly between the two prepared cake pans. Approximately 920 grams of batter per pan.
  6. Bake for 55-65 minutes, or until the cake tops are set and pulling away from the sides. Insert a toothpick into the center; it should come out with moist crumbs, not raw batter.
  7. Let the cakes cool in their pans for 5 minutes. Invert the cakes onto wire cooling racks to cool completely.
  8. To assemble, place one cake layer right side up on a cake board. Spread a generous amount of milk chocolate buttercream over the top. Place the second cake layer upside down on top of the buttercream. Cover the entire cake with a thick layer of buttercream, smoothing the top and sides.
  9. Press ground nuts around the bottom edge of the cake.
  10. Refrigerate the cake for 1 hour to firm up the buttercream.
  11. Prepare the dark chocolate ganache. Ensure it has a pourable consistency, like pancake batter. If too thick, gently warm it; if too thin, chill it briefly.
  12. Pour the ganache over the top of the chilled cake, allowing it to drip down the sides.
  13. Decorate the top of the cake with chocolate truffles.
  14. Refrigerate until ready to serve.

Notes

For the ground nuts, process about 3/4 cup of nuts in a food processor until ground. Be careful not to over-process into nut butter. Roasted and salted nuts are recommended, but raw nuts will also work.
Homemade chocolate truffles can be made by preparing chocolate ganache, chilling it until firm, rolling into balls, and coating as desired. Alternatively, use store-bought truffles.
Cake layers can be stored in the refrigerator for up to 48 hours or frozen for up to 3 months. Buttercream and ganache can also be prepared in advance and stored in the refrigerator or freezer according to the provided guidelines, ensuring they are brought to the correct temperature before use.

Tried this recipe?

Let us know how it was!