Preparation / Directions:
Heat oven to 350 degrees. Grease rectangular baking dish, 13x9x2 inches. Cook and drain spaghetti as directed on package.
Melt margarine in 12-inch skillet over medium heat. Cook bell pepper, celery and onion in margarine, stirring occasionally, until tender. Stir in tomatoes, tomato sauce, cheese, salt and pepper; reduce heat to low. Heat, stirring frequently, until cheese is melted.
Stir in chicken and spaghetti. Spoon into baking dish. Bake uncovered about 30 minutes or until bubbly around edges. Top with chilies.