Preheat oven to 200 C. Grease a 12 cup muffin pan or line each with paper muffin cups.
Mix flour, baking powder, soda, cinnamon, salt and sugar together in a bowl. Mix in egg whites, apple sauce and banana until just moistened. Stir in chocolate bits. Spoon mixture evenly into muffin pans.
Bake in the preheated oven for 15 to 20 minutes or until a wooden skewer inserted in the centre of a muffin comes out clean.