Mix together the smashed bananas, eggs, applesauce, oil and brown sugar in a mixing bowl with an electric beater. Once smooth, add the remaining ingredients to the muffins and mix until combined, adding the chocolate chips at the very end.
Line muffin tins with cupcake liners. Pour a 1/4 cup of the batter into each muffin tin.
Bake at 350 for 15-17 minutes, or until muffins are cooked through and lightly golden brown.