I wanted to try a new twist on chocolate cake for my coffee loving friends. So I experimented a bit and according to my husband, this is the best tasting cake I've ever made! And it was SUPER easy to do!
To get the mocha flavor, I used a box of chocolate fudge cake mix and substituted the water for vanilla flavored coffee that I brewed at home. Before I added the coffee to the other ingredients I made sure it was room temperature. I wasn't sure if it would work hot or not. After the cake was baked, I soaked more coffee right on to the cake with a basting brush.
I also made regular chocolate buttercream and added quite a bit of room temperature coffee right to it. I cut back a little on the milk and continued adding coffee and powdered sugar and cocoa until the flavor and consistency were perfect.