Directions

1. 1 Heat oven to 350°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray. Cook and drain spaghetti as directed on package.
2. 2 Meanwhile, in 12-inch skillet, melt butter over medium heat. Cook bell pepper, celery and onion in butter, stirring occasionally, until tender. Stir in tomatoes, tomato sauce, cheese, salt and pepper; reduce heat to low. Heat, stirring frequently, until cheese is melted.
3. 3 Stir in chicken and spaghetti. Spoon into baking dish. Bake uncovered about 30 minutes or until bubbly around edges. Top with chiles.