Ingredients:
- 2 ½ cups (313g) all-purpose flour, sifted
- ¾ cup (60g) unsweetened cocoa powder, Dutch-processed preferred
- 1 ½ teaspoons baking soda
- ½ teaspoon baking powder
- ½ teaspoon salt
- 1 ½ cups (300g) granulated sugar
- ¾ cup (1 ½ sticks / 170g) unsalted butter, softened
- 2 large eggs
- 1 teaspoon vanilla extract
- 1 cup (240ml) buttermilk, room temperature
- 1 cup (240ml) hot brewed coffee
- 2 tablespoons (30ml) black gel food coloring
- 1 cup (2 sticks / 227g) unsalted butter, softened
- 4 cups (480g) powdered sugar, sifted
- ¼ cup (60ml) heavy cream
- 1 teaspoon vanilla extract
- Royal blue gel food coloring
Instructions:
- Preheat oven to 350°F (175°C). Grease and flour the cake pans, then line the bottoms with parchment paper rounds.
- In a large bowl, whisk together flour, cocoa powder, baking soda, baking powder, and salt.
- In a separate bowl, cream together the butter and sugar until light and fluffy.
- Beat in the eggs one at a time, then stir in the vanilla extract.
- Gradually add the dry ingredients to the wet ingredients, alternating with the buttermilk, beginning and ending with the dry ingredients.
- Stir in the hot coffee and black gel food coloring until well combined. The batter will be thin.
- Pour the batter evenly into the prepared cake pans. Bake for 35-45 minutes, or until a wooden skewer inserted into the center comes out clean.
- Let the cakes cool in the pans for 10 minutes, then invert them onto a wire rack to cool completely.
- In a large bowl, beat the softened butter until light and fluffy.
- Gradually add the powdered sugar, beating on low speed until combined.
- Beat in the heavy cream and vanilla extract until smooth and creamy.
- Add royal blue gel food coloring, a little at a time, until you achieve the desired shade.
- Level the cake layers if necessary. Place one cake layer on a serving plate or cake stand and spread with a generous layer of buttercream. Top with the second cake layer and frost the entire cake with a thin crumb coat of buttercream. Chill for 30 minutes.
- Frost the cake with the remaining buttercream. Use piping bags and assorted flower tips to create a royal blue floral arrangement on top of the cake, as inspired by the reference image.