Super-Easy Marshmallow Icing

"This ridiculously easy recipe produces a thick, glossy icing, very similar to cooked 7-minute icing, or Swiss or Italian meringue. It's easily flavored to taste — we provide instructions here for both chocolate and coffee icing — and it's perfect for piping atop cupcakes or filling a layer cake, as it holds its shape indefinitely. And unlike classic buttercream, it won't wilt or melt in the heat. With just three main ingredients — cream, marshmallows, and confectioners' sugar — there's no need to separate eggs, nor search the cupboard for meringue powder. And with no added fat, beyond that in the whipped cream, it's a lower-calorie alternative to more traditional frostings — though you'd never know it, it's that rich and tasty!..."