Clean Cinnamon Apple Protein Muffins  2 cups rolled oats  1 medium apple, chopped into small cubes, skin on  2 scoops whey protein powder  4 egg whites  1 cup non fat Greek yogurt  6 packets of Truvia (you may want to add more if you like your baked goods sweet)  2 tsp cinnamon  1/2 tsp baking powder