Preheat oven to 425°.
Melt butter.
Add sugar, baking powder, salt, bananas, egg, vanilla and milk in a large mixing bowl and mix with a whisk.
It’s okay to leave some of the lumps from the bananas.
Add flour and 1 cup of chocolate chips.
Stir gently with a wooden spoon just until combined.
Don’t overmix the batter.
Spray 8 large muffin tins or 14 regular muffin tins with cooking spray.
Spoon batter evenly into each muffin tin.
Sprinkle additional chocolate chips over top of batter.
(I added about 15-20 chocolate chips on top of each muffin).
Bake at 425° for 5 minutes.
Adjust temperature to 350°.
Continue baking an additional 15-19 minutes or until a toothpick inserted in center comes out clean.
Cool.
Yield: 8 extra large muffins or about 14-16 regular sized muffins.