I got emailed this today (thank you Xenia)… 

It looks horribly bad for you looking at the ingredients.  However the pictures attached to the email looked very yummy so I think I shall have to give it a go at least once.  As soon as I have eggs in the house I will try, and post pictures of the results.  

4 tablespoons of flour
4 tablespoons of sugar
2 tablespoons of cocoa
1 egg
3 tablespoons of milk
3 tablespoons of oil
Optional – chocolate chips/vanilla essence/alcohol of your choice 

Mix dry ingredients in a mug, add egg, add milk and oil, add anything else.  Stirring between each thing you add in.

Put mug in the microwave for 3 minutes!