We taught you the right way to eat a cupcake. We showed you how to make just four cupcakes. Next up--and get ready for this one--cupcakes that frost themselves. Heres how it works: we start by making brownie batter, which is fast and doesnt require a mixer. Then, when the cupcakes are almost fully baked, we top each one with a marshmallow, return the pan to the oven and watch those white clouds of sweetness melt over the surface.