01 -
Set your oven to 350°F (177°C). Grease two 8-inch cake pans lightly and line the bases with parchment.
02 -
Grab a big bowl and whisk salt, flour, cocoa powder, espresso powder, baking powder, and baking soda together until it looks even.
03 -
In a different large bowl, mix oil, melted butter, granulated and brown sugar, eggs, milk, sour cream, and vanilla with a whisk until it's smooth.
04 -
Slowly add the dry mix into the wet mixture by sifting it in. Alternate with pouring the warm coffee: first some dry mix, then coffee, repeating until all is just combined.
05 -
Split the batter evenly between the two pans (around 675g in each). Bake for 33-38 minutes. Let the cakes cool in the pans for 15 minutes, then turn them out onto a rack and cool completely for 30-60 minutes.
06 -
As the cakes cool, make the syrup. In a saucepan, whisk sugar, water, coffee, cocoa powder, and vanilla. Boil over medium heat for 4-5 minutes until thickened a bit and reduced to about ½ cup. Let cool.
07 -
Trim off the top of each cake to make them flat, if you'd like. This helps soak up the syrup better.
08 -
Brush 2-3 tablespoons (30-45 ml) of the now warm or cooled syrup onto each cake layer. Pop the cakes into the fridge for 1-2 hours to chill before frosting.
09 -
Beat room-temp butter on low for 1-2 minutes until smooth. Stop and scrape the sides if needed. Mix in vanilla, espresso, heavy cream, and salt until combined. Add powdered sugar little by little, beating each time. Once all sugar's in, beat on medium-high for 30-60 seconds for fluffiness.
10 -
Apply a little bit of frosting to the serving plate to hold the base cake steady. Put the first layer down, spread frosting over the top and edges slightly, then place on the second cake layer. Frost the top and sides with a thin, smooth layer (the crumb coat).
11 -
Put the almost-frosted cake into the fridge for 20-30 minutes to firm up the crumb coat. Once it's set, go ahead and frost it fully.