Combine first 8 ingredients in a large bowl, and make a well in center of mixture. Combine banana and next 7 ingredients (banana through egg) in a bowl, and add to flour mixture. Stir just until moist. Spoon batter into 18 muffin cups coated with cooking spray.
Bake at 400° for 18 minutes or until done. Remove from pans immediately, and cool on a wire rack.