Preheat oven to 350°F. Line muffin tin with liners and spray with nonstick cooking spray. (You must grease the liners or they will stick to the muffins.)
Place cereal and milk in a large bowl and allow to soak while you mix the other ingredients.
Whisk flours, baking powder, salt, and sugar in a medium bowl.
Place egg, applesauce, and oil in the bowl with the cereal and mix. Stir in dry ingredients. Scoop into muffin liners, filling 3/4 of the way full.
Bake for 14-18 minutes until a toothpick comes out clean. Cool before eating. Best eaten within two days or you can freeze them for up to one month. To reheat, microwave for 30-45 seconds.
Notes
Sugar: You can reduce to 2 tablespoons if you want less sugar.