PREHEAT oven to 400°F. Spray 13x9-inch baking dish with cooking spray. Place Macaroni in prepared dish. Stir in boiling water; cover with foil.
BAKE 15 min., stirring after 7 min.
STIR in Cheese Sauce Mix, milk and butter. Sprinkle with cheese and crushed crackers. Bake, uncovered, an additional 5 min. or until cheese is melted and crackers begin to brown.
serving size = 1/8 th recipe