Step 1

Make the Cake: Preheat oven to 350 degrees F. Grease three 8-inch round cake pans, line the bottoms with rounds of parchment paper, grease the parchment, then flour the insides of the pans, tapping out excess; set aside.

Step 2

In the bowl of an electric mixer (or large mixing bowl if you’re using a hand mixer), sift together the flour, sugar, cocoa powder, baking soda, baking powder and salt. In a medium bowl, whisk together the eggs, buttermilk, coffee, oil and vanilla.

Step 3

Add the wet ingredients to the dry ingredients and mix for 2 minutes on medium speed. Scrape the sides and bottom of the bowl and mix for an additional 20 seconds (the batter will be very thin).

Step 4

Divide the batter evenly among prepared pans. Bake for 20 minutes and rotate the pans in the oven. Continue to bake until a toothpick inserted into the center of one of the cakes comes out almost clean (with a few moist crumbs), about 12 more minutes. Cool the cakes (in the pans) on wire racks for 20 minutes, then carefully turn them out onto cooling racks to cool completely. [Make-Ahead Tip! At this point you can wrap the layers in plastic wrap and keep at room temperature for up to 1 day, or refrigerate for up to 3 days before frosting and serving. You can also wrap in aluminum foil and freeze for up to 1 month. Thaw in the refrigerator overnight before frosting and serving.]

Step 5

Make the Chocolate Frosting: Place the chopped chocolate in a microwave-safe bowl and microwave in 30-second increments on 50% power, stirring after each, until the chocolate is melted and smooth. Set aside to cool to room temperature.

Step 6

Meanwhile, using the whisk attachment of your stand mixer, whip the butter on medium-high speed for 5 minutes, stopping to scrape the bowl once or twice.

Step 7

Reduce the speed to medium-low and gradually add the powdered sugar. Once all of the powdered sugar is incorporated, add the vanilla, mixing until incorporated. Add the melted chocolate and whip at medium-high speed until light and fluffy, about 2 minutes, scraping the bowl as needed to incorporate all of the chocolate.

Step 8

Assemble the Cake: Place one of the cake layers on a serving platter or cake stand and spread 1 cup of the frosting over the top in an even layer. Place another cake layer on top of the frosting and spread with another 1 cup of the frosting. Place the last cake layer on top of the frosting upside-down, then frost the top and sides of the cake and decorate as desired. The cake can be kept, covered, at room temperature for up to 4 days. You can also freeze the cake, well-wrapped in plastic wrap and aluminum foil, for up to 1 month.