Thanks to Sadeq for this recipe.

The 5 minute chocolate mug cake (photo coming this weekend).

Ingredients:
4 tablespoons of self-raising flour
4 tablespoons of sugure
2 tablespoons of cocoa
1 egg
3 tablespoons of milk
3 tablespoons of oil
3 tablespoons of choc-chips (optional)
A few drops of vanilla essence
1 mug

Method:
Put all dry ingredients in the mug and mix well.
Add the wet ingredients and mix well, ensuring there is no dry mix in the corners of the base.
Place in microwave and nuke for 3 minutes (1000w).
Eat out of the mug while cake is still warm.

Options you can add:
A splash of rum into the mix.
A drizzle of hot fudge sauce after cooking.
A dollop of cream.