HEAT oven to 375°F.
COOK Macaroni in saucepan as directed on package; drain. Stir in milk and Cheese Sauce Mix. Pour into 8-inch square baking dish sprayed with cooking spray.
MIX tomatoes and dressing; spoon over macaroni mixture. Mix butter and cracker crumbs; sprinkle over tomato mixture.
BAKE 15 min. or until heated through and crumbs are golden.