1Heat oven to 350º. Grease 2-quart casserole. Cook and drain macaroni as directed on package.
2Melt margarine in 3-quart saucepan over medium heat. Stir in flour, salt, pepper, mustard and Worcestershire sauce. Cook, stirring constantly, until mixture is smooth and bubbly. Gradually stir in milk. Heat to boiling, stirring constantly. Boil and stir 1 minute.
3Stir in cheese until melted. Stir in macaroni until well coated. Spoon into casserole. Bake uncovered 20 to 25 minutes or until hot in center.