Cola Chicken


4 boneless skinless chicken breasts
1 cup ketchup
1 diet cola
1/2 cup chopped onion (optional)

1 In a skillet, mix ketchup and cola.
2 Add chicken and onions.
3 Bring to a boil and cover. Reduce heat to medium and let cook for 45 minutes.
4 Remove lid and simmer until thickens.