Forgotten Chicken and Rice

Ingredients:

• 1 lb (450g) boneless, skinless chicken breasts
• 2 cups instant rice (white or brown)
• 1 can (10.5 oz) cream of chicken soup
• 1 can (10.5 oz) cream of mushroom soup
• 1 can (10.5 oz) water (use the empty soup can for measurement)
• 1 envelope onion soup mix
• 1 tablespoon butter, for greasing

Optional Additions: