Heat grill. In medium bowl, mix ground turkey, parsley, onion salt and pepper. Shape mixture into 4 patties, 1/2 inch thick. Place patties on gas grill over medium heat or on charcoal grill 4 to 6 inches from medium coals. Cook 11 to 13 minutes or until thoroughly cooked, turning once.
Place 2 tablespoons cheese on each cooked patty. Place patties on bottom halves of buns. Top each with salsa and top halves of buns.