Heat oven to 325°F. Melt 2 tablespoons margarine in large nonstick skillet over medium-high heat. Add onion and celery; cook 3 to 5 minutes or until tender, stirring occasionally. Remove from heat. Add stuffing mix, 1/4 teaspoon thyme, corn and water; mix until moistened. Stir in cheese.
Mound stuffing in center of ungreased 13x9-inch (3-quart) glass baking dish. Place turkey, skin side up, over stuffing. Brush turkey with 2 tablespoons margarine; sprinkle with peppered seasoned salt and 1/4 teaspoon thyme. Cover with foil; insert meat thermometer through foil so bulb reaches center of thickest part of breast meat, but does not rest on bone.
Bake at 325°F. for 2 1/2 to 3 hours or until turkey is fork-tender, its juices run clear and meat thermometer registers 170°F. Remove foil during last 30 minutes of baking. Let stand 5 minutes before serving. Cut turkey into slices; serve with stuffing.