Serve with a spinach salad and crusty French bread.
Coat a large skillet with cooking spray; place over medium-high heat until hot. Add chicken; brown on all sides. Remove chicken from skillet.
Add mushrooms and onion to skillet; cook 2 minutes, stirring constantly. Add chicken, tomato sauce, and next 3 ingredients; bring to a boil. Cover, reduce heat, and simmer 15 minutes or until chicken is done.
Meanwhile, cook spaghetti according to package directions, omitting salt and fat. Drain. Serve chicken and sauce over spaghetti.
501 Delicious Heart Healthy Recipes