INGREDIENTS
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16 oz pasta shells
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4 tbsp butter
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1/3 to 1/2 cup all-purpose flour
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2-1/2 cups milk or heavy cream
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4 oz white American cheese, chopped or torn into pieces
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8 oz extra sharp white Vermont cheddar, shredded
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1 tbsp Dijon mustard
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1 tsp Kosher salt
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1/4 tsp Frank's hot sauce