HEAT oven to 400ºF.
COMBINE stuffing mix, tomatoes 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. Fold foil to make 6 packets. Place on rimmed baking sheet.
BAKE 30 to 35 min. or until chicken is done (165ºF). Cut slits in foil to release steam before opening packets.