01 -
Combine mashed banana, flour, baking powder, maple syrup, and milk in a 12 oz mug. Whisk until batter is uniform.
02 -
Stir in walnuts and half of the chocolate chips.
03 -
Air fry at 350ºF (176ºC) for 6-8 minutes or until the center is set.
04 -
Sprinkle remaining chocolate chips on top and serve.