PREHEAT oven to 350°F. Bring water and 1 Tbsp. of the dressing to boil in large skillet on medium-high heat. Stir in spinach, stuffing mix and peppers; cover. Remove from heat. Let stand 5 min. Set aside.
PLACE chicken, top-sides down, on large cutting board; spread evenly with stuffing mixture. Starting at one of the short ends, tightly roll up each chicken breast. Place, seam-sides down, in 8-inch square baking dish. Brush with remaining 1 Tbsp. dressing.
BAKE 35 min. Sprinkle with cheese. Bake an additional 5 min. or until cheese is melted and chicken is cooked through (170°F).