01 -
Preheat the oven to 350°F (177°C). Lightly grease and line the bottom of (2) 8-inch (23 cm) cake pans with parchment paper.
02 -
In a large bowl, whisk the all-purpose flour, Dutch-process cocoa powder, baking powder, baking soda, espresso powder, and salt until well combined.
03 -
In another large bowl, add the oil, melted butter, granulated sugar, light brown sugar, eggs, sour cream, and milk. Whisk until smooth and well combined.
04 -
Sift the dry ingredients into the wet mixture, alternating with the warm coffee: dry, coffee, dry, coffee, dry. Whisk each addition until just combined before adding the next.
05 -
Evenly divide the chocolate coffee batter between the prepared cake pans, with about 675 g per pan. Bake the cakes for 33–38 minutes. Cool in the pans for 15 minutes, then carefully transfer to a wire rack to cool completely for 30–60 minutes.
06 -
In a small saucepan, whisk together water, brewed coffee, sugar, sifted cocoa powder, and vanilla extract. Bring to a boil over medium-high heat for 4–5 minutes. Reduce to about ½ cup and let cool.
07 -
Evenly cut the top crust off each cake layer for better syrup absorption. Brush 2–3 tablespoons (30–45 ml) of the cooled coffee syrup onto the tops of the cakes. Refrigerate the layers for 1–2 hours.
08 -
Beat the softened butter until smooth (1–2 minutes on low speed). Add vanilla extract, salt, brewed espresso, and heavy cream, mixing to combine. Gradually beat in sifted powdered sugar, ½ cup (60 g) at a time, until fully incorporated. Beat on medium-high for 30–60 seconds until desired consistency is reached.
09 -
Spread a small amount of frosting onto the serving plate or cake stand to secure the first cake layer. Add frosting to the top and slightly over the sides of the cake. Repeat for the second layer. Apply a thin crumb coat over the entire cake. Refrigerate for 20–30 minutes. Apply the remaining frosting, smooth the sides, and top with swirls of buttercream if desired. Drizzle with extra coffee syrup before serving.