Microwave mug cake

1 tbsp butter or margarine
1 egg
1 tsp vanilla essence
2 tbsp sugar or artificial sweetener
2 tbsp cocoa
1 tbsp milk
pinch salt

Method
Melt the fat in microwave for 30 sec, then add the egg and mix well
Add the sweetener, vanilla, cocoa powder and give a good mix, then add the milk and pinch of salt.
Mix until no lumps remain and then microwave in a mug or bowl for 1 to 1.5 mins