Now, if only I could find THE chocolate frosting!
1 1/2 cups all-purpose flour
1 t baking soda
1/2 t baking powder
1/4 t salt
1 1/4 c boiling water
4 oz unsweetened chocolate, chopped
1/2 c Dutch-processed cocoa powder
1 t instant coffee
10 T (1 1/4 sticks) unsalted butter, softened
1 1/2 c packed light brown sugar
3 large eggs, room temperature
1/2 c sour cream, room temperature
1 t vanilla extract
Adjust oven racks to upper-middle and lower-middle positions and heat the oven to 350 degrees. Grease three 8-inch round cake pans, then dust with cocoa powder and line the bottoms with parchment paper. Whisk the flour, baking soda, baking powder, and salt together in a large bowl. In a medium bowl, whisk the boiling water, chocolate, cocoa powder, and instant coffee together until smooth.
In a large bowl, beat butter and sugar together with an electric mixer on medium speed until light and fluffy, 3-6 minutes. Beat in eggs, one at a time, until incorporated, about 30 seconds. Beat in the sour cream and vanilla until incorporated.
Reduce speed to low and beat in one-third of flour mixture, followed by half of the chocolate mixture. Repeat with half of the remaining flour mixture, and remaining chocolate mixture. Beat in remaining flour mixture until just incorporated.
Give batter a final stir with rubber spatula to make sure it si thoroughly combined. Scrape the batter into the prepared pans, smooth the tops, and gently tap the pans on the counter to settle the batter. Bake the cakes until a toothpick inserted in center comes out with a few crumbs attached, 15-20 minutes, rotating and switching the pans halfway through baking.
Let cakes cool in pans for 10 minutes. Run a small knife around the edge of cakes, then flip out onto wire racks. Peel off parchment paper, flip cakes right side up, and let cool completely before frosting, about 2 hours.