HEAT oven to 350°F.
BRING water and 1 Tbsp. dressing to boil in large skillet on medium-high heat. Add spinach, stuffing mix and peppers; mix lightly Cover. Remove from heat. Let stand 5 min.
PLACE chicken, top-sides down, on cutting board; spread with stuffing mixture. Starting at one short end, tightly roll up each breast. Place, seam-sides down, in 8-inch square baking dish. Brush with remaining dressing.
BAKE 35 min. or until chicken is done (170ºF). Sprinkle with cheese; bake 5 min. or until melted.
serving size = 1 stuffed breast (218 g)