To prevent the rice from sticking to the foil, spray foil with cooking spray before using. Or, use nonstick foil.
If the chicken breast halves in your market are larger than 1/4 lb. each, they will take longer to cook. Be sure to cook them long enough so that they are no longer pink in the centers and the juices run clear (165°F).
Substitute 1 pkg. (10 oz.) frozen corn, thawed, for the broccoli.