Chocolate & Peanut Butter Cupcake In A Mug 5 "Chocolate heaven in a mug. What could go wrong?!" Mrs Mulholland 16 February 2019 The title says it all. You won't he disappointed. Simply follow the recipe on the mug and it's done. It's a decent size mug and well worth getting. Wish I bought more for family and friends. To add, instead of using the peanut butter, I tried hazelnut chocolate spread, creme egg, chocolate buttons and marshmallows to add a different twist to the recipe. Mmmmmm! A note from the team WoW, that sound like a chocolate lovers heaven.