HEAT oven to 375°F.
ADD Macaroni to large saucepan of boiling water; cook 6 min. or until tender. Drain. Stir in milk and Cheese Sauce Mix.
POUR into greased 8-inch square baking dish. Mix tomatoes and dressing. Top macaroni mixture with tomato mixture. Drizzle butter over cracker crumbs; toss with fork. Sprinkle over tomatoes.
BAKE 15 min. or until heated through and crumbs are golden.