For an easy addition to this salad, place baguette slices on the grill while you're cooking the chicken. Grill the bread slices for 2 minutes on each side; then rub the slices with the cut side of a halved garlic clove.
While grill heats, prepare Caesar Dressing. Reserve 1/3 cup dressing in a separate bowl; set aside.
Place chicken on grill rack coated with cooking spray over medium-high heat. Grill 2 to 3 minutes on each side or until done, basting frequently with remaining dressing. Remove from grill. Cool slightly; slice.
Combine chicken, reserved 1/3 cup dressing, lettuce, and tomato in a large bowl; toss gently to coat. Divide salad evenly among each of 4 bowls. Sprinkle each serving with 1 tablespoon cheese.