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Mash the banana in a small bowl and mix in oil and vanilla extract.
Put the flour, sugar (if using), baking powder and salt in a small espresso mug. Blend thoroughly with a fork.
Add the mashed bananas, mix in any additional mix-ins like chocolate chips, nuts, etc.
Microwave 90 seconds then let it cool about 1 minute before eating. If making a double batch in a large mug, cook 2 minutes.