Preheat oven to 375 °F (190 °C). In a large bowl, combine turkey, spinach, onion, bread crumbs, parsley, oregano, egg whites, Worcestershire sauce, salt and pepper. Mix well.
Press half of mixture into an 8" loaf pan. Top bottom half with grated mozzarella and parmesan cheese. Press remaining turkey mixture over top and flatten to make an even layer. Whisk together ketchup and mustard and spread mixture over prepared meatloaf.
Bake 1 hour, until top is golden and loaf has pulled slightly away from sides of pan. Let stand 10 minutes, then slice into 6 equal pieces and serve.
There are 215 calories in 1 serving of Cheese Stuffed Turkey Meatloaf.