1Place chicken in shallow dish. Pour dressing over chicken. Cover and refrigerate about 30 minutes.
2Heat closed medium-size contact grill for 5 minutes. Remove chicken from marinade; reserve marinade. Sprinkle chicken with garlic pepper. Place chicken on grill. Close grill. Grill 4 to 6 minutes, brushing with marinade once, until juice of chicken is no longer pink when centers of thickest pieces are cut. Discard remaining marinade.
3Sprinkle each chicken breast with basil; top with tomato and cheese. Let stand on grill 3 to 5 minutes or until cheese is melted.