In large bowl, gently mix turkey, bread crumbs, milk, Worcestershire sauce, mustard and pepper with fork until well combined. Shape mixture by heaping tablespoonfuls into 20 balls. Flatten each ball into 3-inch patty. Cut each cheese slice in half crosswise; place 1 piece of cheese in the center of each of 10 patties. Top each with another patty; press edges together to seal.