01 -
Heat the oven to 350°F (177°C). Lightly grease two 20 cm round cake pans and line their bases with parchment paper.
02 -
In a big bowl, combine the flour, cocoa powder, baking powder, baking soda, espresso powder, and salt until well blended.
03 -
In a separate large bowl, add oil, melted butter, granulated sugar, brown sugar, eggs, sour cream, milk, and vanilla. Whisk everything until smooth.
04 -
Sift the dry ingredients into the wet mixture in intervals, alternating with the hot coffee: start with dry, add coffee, repeat until combined. Stir gently each time.
05 -
Evenly pour the batter into the prepared pans (about 675 g per pan).
06 -
Bake the cakes for 33-38 minutes. Let them cool in their pans for 15 minutes, then turn them out onto a rack to cool completely for 30-60 minutes.
07 -
Combine water, coffee, granulated sugar, sifted cocoa powder, and vanilla in a small saucepan. Heat on medium-high for 4-5 minutes until reduced to about ½ cup. Allow it to cool.
08 -
Trim the tops of the cakes (optional) and brush each layer with 30-45 ml of cooled syrup. Chill the cake layers in the fridge for 1-2 hours before adding the frosting.
09 -
Whip the softened butter until creamy (1-2 minutes on low speed). Mix in the vanilla, salt, espresso, and heavy cream. Gradually add the sifted powdered sugar, beating after each addition. Once combined, beat on medium-high speed for 30-60 seconds until fluffy.
10 -
Spread a layer of buttercream between the cake layers, smooth the sides, and swirl the remaining frosting on top. Add the coffee syrup as decoration if you'd like.