Preheat oven to 350 degrees. Saute celery, onion, and mushroom pieces in margarine in a large skillet. Stir in soup, sour cream, water chestnuts, green chiles, and turkey or chicken. Mix well. Add cooked spaghetti. Spoon into buttered baking dish. Sprinkle with cheese & paprika. Bake for 40 minutes or until bubbly. ENJOY!