Preheat oven to 350℉ and place oven rack in center of oven.
Grease and flour cake pans. I usually bake mine in three 9” pans but not because it is the magic size…because I don’t have any 8” pans.
Melt the butter in saucepan over medium heat.
Whisk in cocoa powder a bit at a time so it does not clump up.
Add coffee and milk, whisking until incorporated.
Add in both sugars, eggs, and vanilla and whisk until smooth.
In a separate bowl, stir together dry ingredients.
Add dry ingredients to wet ingredients until combined.
Divide batter between pans and bake in the center of the oven until a toothpick inserted in the sponge comes out clean. About 20-22 minutes.
Remove from oven and allow to cool on a wire rack.