HEAT oven to 400ºF.
STIR tomatoes, stuffing mix and garlic just until stuffing mix is moistened.
PLACE 1 chicken breast on center of each of 6 large sheets heavy-duty foil sprayed with cooking spray; top with basil, stuffing mixture and cheese. Bring up foil sides; fold to make packets. Place in 15x10x1-inch pan.
BAKE 30 to 35 min. or until chicken is done (165ºF). Cool 5 min. Cut slits in foil to release steam before opening packets.