Preheat the oven to 350 degrees F. In a large mixing bowl combine ground turkey, rolled oats, onion, parsley, Worcestershire sauce, oregano, and egg whites; mix well with your hands. Roll into 12 equal size balls 2-3 inches round. Place on a baking sheet sprayed with nonstick cooking spray. Bake in the preheated oven for 25-30 minutes, turning carefully with a spatula half-way through.