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Preheat oven to 350 degrees.
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Boil macaroni, slightly undercook.
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Mix shredded cheese with flour, mustard, and pepper.
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Put 9X13 pan in oven with butter in it to melt. Swish around pan and pour into milk.
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Put half of the macaroni in pan and sprinkle half of the cheese over. Add other half of macaroni and cover with remainder of cheese.
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Stir milk/butter mixture and pour evenly over casserole.
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Cover with foil, and cook for 20 minutes. Uncover, stir and cook for 10 more minutes.