INGREDIENTS
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1 lb. pasta shapes, such as shells
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4 tbsp. unsalted butter
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1/3 cup all-purpose flour
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2½ cups milk or half-and-half
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1 tsp. salt
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1½-2 tsp. Dijon mustard
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¼ tsp. hot sauce
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4 oz. white American cheese, finely chopped
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8 oz. white cheddar cheese, shredded