Microwave Mug Cake

1 coffee mug
4 TB flour (not self rising)
4 TB sugar
2 TB baking cocoa
1 egg
3 TB milk
3 TB oil
3 TB chocolate chips (optional)
some nuts (optional)
small splash of vanilla

Add dry ingredients to mug and mix well.
Add the egg and mix thoroughly.
Pour in the milk and oil and mix well.
Add chips if using and vanilla. Mix well.
Cook for 3 minutes on high.
The cake will rise over the top of the mug.
Allow to cool a little and tip out onto a plate if desired.