The mug cake is a warm, sweet little confection for one. And so quick and easy to make: A few spoonfuls of flour, sugar, butter, maybe some cocoa or fruit, sometimes egg and in less than two minutes in the microwave, there's a delicious cake. Here are the best of the best recipes, for cakes from decadent to healthy(ish), including Raspberry Cobbler Mug Cake, Apple Spice Mug Cake, Nutella Mug Cake and Coffee Crumb Mug Cake.