Mozzarella-Stuffed Turkey Meatloaf

1.5 lbs ground turkey
1/2 cup seasoned dry breadcrumbs (or 1/4 breadcrumbs and 1/4 parmesan)
1 tsp dried oregano
1/2 tsp salt
4 oz. grated mozzarella cheese (1 cup)
1 (10 oz.) package frozen chopped spinach, thawed and squeezed
1/2 cup minced onion
1/4 cup chopped fresh parsley
2 egg whites
1/4 tsp ground black pepper
2 tbsp ketchup
2 tbsp dijon mustard

Preheat oven to 375.  In a large bowl, combine turkey, spinach, onion, bread crumbs, parsley, oregano, egg whites, salt and pepper.  Mix well with hands.  Press half the mixture into an 8-inch loaf pan.  Top bottom half with grated 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.