A decadent treat whipped up in a mug and ready in 3 minutes!
In a very large mug, mix the egg and sugar with a fork. Add all remaining ingredients except Nutella, and mix very well.
Pop Nutella into centre of mix, and only stir lightly.
Cook on High in microwave for 2 to 2 and a half minutes maximum. The longer you cook it, the less gooey it will be.
Enjoy hot, with a big scoop of vanilla ice cream!
For extra crunch you could add some of your favourite nuts to the mix.