INGREDIENTS
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1/2 lb macaroni or other dry pasta
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1 tbsp butter
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1 tsp yellow mustard
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1 whole large egg, lightly beaten
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1/2 tsp salt
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3 cups (about 12 ounces) grated cheddar or other yellow cheese (divided use)
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1 tablespoon all-purpose flour
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1-1/2 cups milk