In a large bowl, combine the flour, sugar, baking powder and salt.
In a smaller bowl, combine the egg, milk, oil, banana and applesauce; stir into dry ingredients. just until moistened. Fold in the chocolate chips.
Fill muffin cups two-thirds full (I usually line my muffin tins). Bake in preheated oven for 20 minutes or until a toothpick inserted comes out clean. Cool for 5 minutes before removing from pan to wire rack.