Preheat oven to 375F. Line muffin tin with paper liners or spray with non stick spray.
Mix flour and baking soda together in a bowl, mash bananas and add into bowl with all other ingredients.
Fill muffin holes 3/4 of the way full, it will fill 9 of them. Bake for 14-16 minutes or until top springs back when gently touched in the center. Check at minute 14, do not overbake.
Immediately remove from hot pan and transfer on to a cooling rack to stay as moist as possible.
Notes
Tips for Keeping Muffins Moist
Do not over-bake. Check at minute 16. Touch gently in middle of 1 muffin. If it springs back remove pan immediately. If it sinks bake 1 more minute and check again. Remove from the hot muffin tin immediately after it has been pulled out and place them on a cooling rack.