COMBINE chicken, soup and Cheez Whiz. Stir until well blended.
DIVIDE mixture among tortillas. Roll-up; place seam side down in 13x9-inch baking dish. Top with tomatoes and cheese; cover with foil.
BAKE at 350°F 30 to 35 min. or until cheese is melted and enchiladas are heated through, removing foil during last 10 min. of baking.