SOURCE: Modified from recipe found on Recipezaar
4 chicken breasts (skinless, boneless)
1 cup ketchup
1 can diet cola
1 onion, chopped
1 bell pepper, chopped
Mix ketchup and cola in large skillet or saucepan. Stir in chopped onion and pepper; add chicken breasts. Bring mixture to boil, then cover and cook on medium heat for 45 minutes.
Alternatives: Wait to add onion and bell pepper til near the end of cooking for crunchier veggies. Could also add additional veggies, such as sliced mushrooms, cubed potatoes, and so on.