Prepare the muffin pan using lowfat cooking spray and preheat oven to 425 degrees. Combine the flour, sugar, cinnamon, baking powder, and salt in a bowl. Mix well. Lightly beat the egg and mix in the milk. Add the applesauce and egg/milk to the flour mixture and mix until just moistened.
Try to avoid overstirring, as this may create “tunneling” in the finished muffin.
Spoon the mixture into the muffin pans and bake for about 17 minutes. Test for doneness with a toothpick: if the toothpick comes out moist, then let cook for another minute or so. If dry, then muffins are done.