Heat oven to 350°F. Line broiler pan with foil; spray foil with cooking spray. In large bowl, mix beef, onion, bread crumbs, ketchup, salt, pepper and eggs. On work surface, shape meat mixture into 4 (6x2-inch) loaves, inserting 1 cheese stick lengthwise in center of each loaf. Taper ends of loaves to look like mummy shapes. Place in pan. Bake 25 minutes.