1) Cook Macaroni 1 minute less than package instructions
2) melt butter. Stir in flour, salt, pepper, mustard & Worcestershire. Cook over low heat stirring constantly until smooth & bubbly.
3) Stir in milk. heat to boiling stirring constantly until thickens. Remove from heat.
4) Stir in cheese until melted.
3) Bake uncovered at least 25 minutes
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