INGREDIENTS
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Salt
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2 pounds elbow macaroni
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10 ounces (2 1/2 sticks) unsalted butter
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1 1/2 cups all-purpose flour
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1/2 teaspoon mustard powder
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1/2 teaspoon seasoned salt, such as Lawry's
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1/2 teaspoon salt
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1/4 teaspoon ground black pepper
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4 cups whole milk
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3 cups shredded yellow American cheese
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3 cups shredded gouda
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5 cups shredded extra-sharp Cheddar
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1/2 tablespoon smoked paprika