Whipped Chocolate Buttercream Frosting

"I highly suggest using semisweet or bittersweet chocolate even if you are mostly a milk chocolate fan. The chocolate lightens beautifully and doesn't have an overly dark chocolate taste. And speaking of chocolate, use a good-quality chocolate chip. It really does make a difference since that is the only chocolate flavor in the recipe. Ghirardelli semisweet or bittersweet chocolate chips are my preference - they taste amazing and melt really well. If refrigerating this frosting, you may need to let it come to room temperature and whip it with an electric mixer for 1-2 minutes before using it to frost a cake/cupcakes. The frosting is on the soft, creamy side - I've used it to pipe swirls on cupcakes but haven't used it for finer piping like a small star tip for cakes. Finally, if you are using unsalted butter, throw in a pinch of salt with the powdered sugar...."