Save time by using a box of Betty Crocker® SuperMoist® milk chocolate cake mix for the scratch cupcakes. The mix will make 24 cupcakes, so you’ll need to double the amounts of ganache and frosting.
Place frosting in the refrigerator if it becomes too soft to pipe.
To make your own buttermilk, use 4 1/2 teaspoons of lemon juice or vinegar plus milk to equal 1 1/2 cups. Let sit for 5 minutes.