How to Make Banana Bread in a Mug

1. In a large, microwave-safe coffee mug, mash your ripe banana. Add the egg, buttermilk, vanilla extract, oil, flour, brown sugar, baking powder, salt, and cinnamon (if using). Mix to combine.
2. “Bake” it in the microwave for 2 to 3 minutes. (You can stop and check for doneness at the 90-second or 2-minute mark.)
3. The banana bread will be very hot, so allow it to cool for a few minutes before eating it.
4. Top with whipped cream, pecans, and sliced banana, if desired.

Source: Tiphero.com