Preheat oven to 450 degrees F. Line large baking sheet with parchment paper and spray with nonstick cooking spray.
Heat olive oil in a large frying pan over medium heat. Add onions and garlic and cook until garlic becomes fragrant, about 3 minutes.
Add in chopped apples and cook a few minutes more or until apples soften. Remove from heat, transfer to a large bowl, and stir in cinnamon and nutmeg.
Add in ground turkey, maple syrup, egg whites, oat flour, and salt and pepper; mix well. Divide into 16 patties and place on prepared baking sheet. Bake for 10 minutes or until turkey is no longer pink.