Nadine, for vanilla I'd just leave out the cocoa powder entirely.

How did your Vanilla Spicy Nut Mug Cake go - it sounds divine!!! Was too full after a roast for Mug Cake last night, so am trying it tonight to eat while watching State of Origin. Can't decide whether to try your version or stick with the chocolate. I could try Choc with nuts?? Hmmmmmm....................