Preheat oven to 375. In saucepan, melt butter;
stir in flour, mustard, and salt. Stir in milk.
Cook and stir until mix thickens slightly (should
coat spoon).
Remove from heat.
Add 1 1/2 cheese. Stir until melted.
Stir in cooked macaroni. Turn into greased 1 1/2
qt shallow baking dish.
Top with remaining cheese.
Bake 20-25 min or until bubbly.
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