Cake In a Mug
Get out a big coffee mug for this.
You're going to Zap this in the microwave so don't have to pre-heat the oven. Either grease your mug with butter or spray it with oil. 
Add all of the dry ingredients to a large coffee mug and mix. Add the egg and combine well with a fork. Stir in milk and oil. Add chocolate chips and vanilla. Stir well.
Into the microwave. 1000W for about 2 mins 45s. 750/800W for 3 mins. All microwaves are a bit different but it should be about right. Watch it go round ... better than TV. And don't panic when it starts coming over the top - it'll calm down.
Eat with icecream if you have any.
