I got this recipe from a Trade Me newsletter and had to give it a go.

It's called: The most dangerous cake recipe 5-minute chocolate mug cake

4 Tb flour, 2-4 Tb sugar, 2 Tb cocoa, 1 egg, 3 Tb milk, 3 Tb oil 3 tablespoons, chocolate chips (optional), a small splash of vanilla extract, 1 large coffee mug
Add dry ingredients to mug and mix well. Add the egg and mix thoroughly. Pour in the milk and oil and mix well. Add the chocolate chips (if using) and vanilla extract, and mix again. Put your mug in the microwave and cook for about 2 minutes at 1000 watts (high). The cake may rise over the top of the mug, but don't be alarmed!
Allow to cool a little, and tip out onto a plate if desired. EAT!

The original recipe said cook for 3 mins, but I found my mug cake a little on the dry side so I suggest 2 mins first then check. I also used less sugar than the original and I used gluten free flour.

Not a bad recipe to satiate chocolate-craving stomachs.