– Insert the peanut butter bourbon ganache into the hole (directions below) until it is filled to the the top. You may do this via piping, as I did, or you may spoon the ganache into cupcake hole. – Pipe the buttercream vanilla frosting bourbon frosting on top of the cupcake. If you do not have a piping bag, you may cut a small hole in the corner of a zip lock bag and pip the frosting on it that way. In the alterative, you may spoon the frosting on top.