In a small bowl, mix the dry ingredients
Add the egg and stir lightly
Add the oil and milk and continue mixing until you get a smooth batter
Add the chocolate chips and vanilla extract and stir gently
Pour the batter into mug (fill mug up to 2/3 full).
Microwave for 50 seconds to 1 minute
Eat warm, make it a special treat and serve with chocolate syrup, whipped cream or vanilla ice cream