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Preheat the oven to 350. Spray a standard muffin tin with cooking spray and set aside.
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In a medium bowl, whisk together egg white, egg, milk, apple sauce and vanilla extract until combined. Whisk in brown sugar. Switch to a spatula or wooden spoon and stir in oats, baking powder, cinnamon and salt until combined. Gently fold or mix in chopped apples.
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Portion evenly into prepared muffin tin and bake for 20 minutes, until muffins are beginning to brown and a toothpick inserted into the center comes out clean.
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Serve hot, or, allow to cool before transferring to an airtight container. Store in the refrigerator until ready to serve. Microwave for 30 seconds until hot, before serving.