PREHEAT oven to 400°F. Coat chicken with coating mix as directed on package. Place on foil-covered baking sheet.
BAKE 20 minutes or until cooked through. Top each chicken breast with 2 Tbsp. of the cheese. Bake an additional 2 minutes or until cheese is melted.
SPREAD cut sides of rolls evenly with mustard. Fill with chicken, lettuce and tomatoes.