Preheat oven to 350 F.
Spray a muffin tin with spray oil.
In a medium-sized mixing bowl, cream together sugar and butter with a mixer.
Mix in the eggs until well blended.
Mix in the bananas, using your mixer until no chunks remain.
Mix in the applesauce and vanilla extract.
In another mixing bowl, mix together flour, baking soda, baking powder, and salt.
Slowly add the dry mixture to the wet mixture until everything is combined.
Fold in your chocolate chips until combined.
Spoon muffin mix into muffin tins filling 3/4 full with batter. Making approximately 12 muffins.
Bake for 18-20 minutes until cooked through.
Remove from oven and let cool for 10 mins.
Transfer to a cooling rack and cool for another 10 mins.