I know this looks like a mug of hot chocolate, but if you dig in, you'll find a rich chocolate peanut butter cake. Yum!
Mug cakes I know were the rage several years ago, but it is nice to have a tested recipe on hand when you need a quick dessert for one or two. I wouldn't do this for a group because it is really designed to serve one. If you do double it, my recommendation is to prepare the cake mix in a separate bowl and pour into the mug.