If you're ever in a situation where you're worried about not having enough frosting to finish a cake, then Aimless Direction has you covered. The random topic weblog recommends using a mixer to beat the frosting to help double up your batch. The trick to this is that the mixer adds more air to batch resulting in more frosting.
So keep this tip in mind the next time you're worried about not having enough frosting for all your cupcakes, or even if you
just want your frosting less sweet.