Place pork chops in skillet near center. Sprinkle onion around pork chops. Cook 3 to 5 minutes or until pork chops are golden brown, turning once. In small bowl, combine cider, mustard, salt, thyme and pepper; mix well. Pour over chops. Reduce heat to low; cover and cook 10 to 15 minutes or until pork is no longer pink in center.