Preheat to 350°F (176°C) and lightly grease three 9-inch round cake pans. Dust with flour or cocoa powder, or line the bottoms with parchment for easy removal. Having three pans means a show-stopping, tall cake—you’ll love the dramatic reveal when you slice into those layers.

Warming the plates and pans slightly helps birds-eye even baking and makes those luscious layers rise evenly.

In a large mixing bowl, whisk together flour, sugar, cocoa powder, baking soda, baking powder, and salt. Use a hand mixer on low speed just to combine. Don’t skip that salt—it “wakes up” the sweetness, adds contrast, and makes the chocolate taste more decadent.

Pour in the eggs, buttermilk, warm water or coffee, vegetable oil, and vanilla extract. Mix on low until just smooth, scraping the sides and bottom with a rubber spatula to ensure nothing is left unincorporated. The batter should be thin—trust this. Thin is your ticket to moist, cakey layers.

Divide the batter evenly among the pans (about 3 cups per pan). Tap the pans gently on the countertop to release air bubbles, then slide them into the hot oven.

Bake for 30–35 minutes, until a toothpick inserted into the center comes out clean (a few moist crumbs are okay). The cake should spring back slightly and the edges pull away from the pan. Let them cool in the pans on a wire rack for 15 minutes before gently unmolding and transferring them to the rack to cool completely.

Gently melt the chocolate using a double boiler or a heat-proof bowl over simmering water. Once smooth, remove from heat and cool slightly—warm, not hot, is perfect.

In a stand mixer fitted with the paddle attachment, beat the cream cheese and butter on medium-high for 3–4 minutes, until pale, fluffy, and utterly dreamy. This stage adds air, lightness, and a silky mouthfeel to the frosting.

Lower the mixer speed and gradually add confectioners’ sugar, cocoa powder, and a pinch of salt. Scrape the bowl as needed—this ensures an even texture.

With the mixer on low, pour in the cooled chocolate and sour cream. Increase speed to medium-high and beat until completely smooth. Watch that glossy sheen appear—this frosting’s ready for glory.

Because it’s cream cheese–based, it sets quickly. Frost your layers while spreadable but not runny.

If any of the cake layers domed in the center, level them with a serrated knife to stack neatly.

Place the first layer on a cake stand or plate, dollop frosting generously, then repeat with second layer.

Add the top layer and crumb-coat the entire cake (thin layer) to capture crumbs. Refrigerate for 10 minutes, then apply the final sumptuous coat of frosting.

Finish with chocolate shavings, cocoa dusting, or berries for garnish.