In a microwave safe mug, mix all the dry ingredients - flour, cocoa powder, sugar, salt, baking powder and walnuts
Add the milk, oil, vanilla essence and mix throughly so that no dry patch appears. Add the Nutella in the centre of the batter and microwave on high for 60 to 90 seconds
Remove, dust with icing sugar and top with more walnuts and strawberries. Serve warm or at room temperature. Enjoy your chocolate Nutella mug cake
Notes
The time to cook the mug cake will depend on your microwave and also the size of your mug