I actually found this works a lot better in a high rimmed bowl, but you CAN use a mug if you insist :)
Dry ingredients, mixed in cooking bowl/mug:
2 Tablespoon plain flour
1 Tablespoon quick oats (or plain flour)
1 Tablespoon brown sugar
1 Tablespoon white sugar
1/4 teaspoon baking powder
large pinch cinnamon
pinch ginger
Wet ingredients, mixed in a different bowl:
1 mashed banana
1.5 Tablespoon chunky peanut butter
1 egg
dash vanilla essence
Fold the wet ingredients into the dry, don't mix for too long.
Microwave about 2 minutes on high. Let sit for a minute if you can bear it and then eat. Nice with defrosted frozen blueberries added to the wet ingredients and/or sprinkled with sugar once cooked.
Nice with maple (flavoured) syrup. The spices and vanilla are optional. You can make it without baking powder but it's super dense. Ends up a little goopy in the middle, if you prefer a drier cake only use half a banana.
I get cravings for sugar, eggs and carbs sometimes and this fulfills that pretty well hurrah. Adapted from several other recipes, all of which either called for masses of fat and sugar or didn't fit my personal definiton of "cake" (I'm still not sure if I'm brave enough to try
this recipe)