Easy Chocolate Cake

Microwave Mug Cake
serves 1
prep time 5min
cook time 2min

Ingredients
4 tbsp self-raising flour
4 tbsp caster sugar
2 tbsp cocoa powder
1 medium egg
3 tbsp milk
3 tbsp vegetable oil or sunflower oil
a few drops of vanilla essence or other essence
(orange or peppermint work well)
2 tbsp chocolate chips, nuts, or raisins etc