Combine all ingredient together in a small bowl and whisk together.
Divide the mixture evenly between two mugs - or tea cups if your prefer! Make sure the cup/mug is no more than ½ full as it will rise.
Place in the microwave and cook on high for 1 ½ - 2 minutes depending on your microwave and cup size. My cakes took just 1 ½ minutes.
Allow cake to cool slightly before adding a scoop of vanilla ice-cream and enjoy!