PREHEAT oven to 350°F. Cut lengthwise slice from top one-third of bread loaf. Remove center of loaf, leaving 1/2-inch-thick shell. Reserve removed bread for another use. Brush inside of loaf and cut-side of top evenly with 2 Tbsp. dressing.
PLACE bread, cut-sides up, on baking sheet. Bake 5 min. or until lightly toasted; cool.
TOSS greens with chicken, peppers and cheese. Add 1/3 cup dressing; mix lightly. Spoon into bread shell; cover with top of loaf. Cut crosswise into pieces to serve.