Preheat the oven to 400 degrees F. Spray muffin pan with cooking spray. Combine the oat mixture with the applesauce and egg whites, and mix until combined.
In a separate bowl measure and whisk the dry ingredients (flour, sugar, baking powder, baking soda, and salt) together. Add wet ingredients to dry and mix until just combined. Add nuts or raisins if desired. Do not over mix the batter or the muffins will be tough.
Spoon muffin mixture into muffin pan. Combine the cinnamon and sugar and top each muffin with some of the mixture.
Bake for 20-25 minutes or until done. Remove from pan, cool and enjoy.