2 tablespoons sugar
2 tablespoons coco powder
4 tablespoons plain flour
1/2 teaspoon baking powder
Put the butter in a mug and microwave it for around 30 seconds (or until it's melted)
Grab a fork, and whisk in the egg, sugar, coco powder, flour and baking powder.
Once it's combined, put the mug back in the microwave for 1 minute (for 800Ws)
Take it out (be careful, the might be pretty hot), and leave to cool for a minute before digging in!
Totally optional, but you can decorate with extra coco powder, icing or sprinkles if you want.