Cook macaroni in boiling salted water until 'al dente'. Approximately 5-6 minutes.
Meanwhile, in a small saucepan, melt butter. Stir in flour, salt, mustard, pepper and hot pepper sauce. Cook and stir until smooth.
Drain macaroni; combine with butter mixture in a large bowl and mix well. Stir in milk and 2 1/2 cups of cheese.
Pour into an ungreased 2 1/2 quart baking dish. Cover and bake at 35 degrees for 3 minutes or until bubbly.
Sprinkle with remaining cheese; let stand 5 minutes before serving.
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