Prepare couscous according to package directions using olive oil. Fluff with fork; cool in a large bowl, fluffing occasionally.

Reserve 1/4 cup dressing for basting chicken. Brush chicken with 2 tbsp of the reserved dressing. Broil chicken in oven or grill over medium-hot coals 5 to 7 minutes. Turn chicken and brush with 2 more tbsp dressing. Grill an additional 5 to 7 minutes or until chicken is no longer pink inside. Discard any remaining dressing used for chicken. Thinly slice chicken crosswise.

Just before serving, lightly toss couscous with chicken, remaining 1/2 cup dressing, lettuce and half of the cheese until evenly distributed.

Portion onto plates and sprinkle with remaining cheese.