Start with a large mug or ramekin (must hold at least 12oz / 355ml)Add butter, honey and cocoa to the mug. Melt for a couple seconds in the microwave and then mix together until smooth (This only takes around 10 - 15 seconds in mine).Add flour, baking powder, vanilla, egg to the mug. Mix together until smooth. Microwave for 50 - 60 seconds (My microwave takes EXACTLY 50 seconds for a perfect mug cake). You don't want to over cook the cake it is will end up too dry. A good way to know you're close to perfect is when the cake rises out of the mug. Serve with Clean Eating Custard or Whipped Cream and Strawberries.