Preheat oven to 375ºF.

In a large bowl, mix dry ingredients together.

In a smaller bowl, beat egg.

Stir in the mayo.

Add the wet ingredients to the flour mixture and stir until just moistened.

Stir in mashed bananas.

Spoon batter into 12 greased or paper-lined muffin tins.

Sprinkle with chocolate chips and/or nuts.

Bake in preheated oven for 20 to 25 minutes, or until lightly browned.

Eat and enjoy!