Step 1

Mash the banana in a small bowl and mix in oil and vanilla extract.

Step 2

Put the flour, sugar (if using), baking powder and salt in a small espresso mug. Blend thoroughly with a fork.

Step 3

Add the mashed bananas, mix in any additional mix-ins like chocolate chips, nuts, etc.

Step 4

Microwave 90 seconds then let it cool about 1 minute before eating. If making a double batch in a large mug, cook 2 minutes.