INGREDIENTS
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1 pound elbow macaroni
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6 slices white bread, cut into 1/4-inch pieces
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1/2 cup (1 stick) unsalted butter, divided
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5 1/2 cups whole milk, warmed
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4 1/2 cups sharp white cheddar cheese, grated, divided
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2 cups gruyere cheese, grated, divided
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1/2 cup all-purpose flour
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2 teaspoons kosher salt
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1/4 teaspoon ground black pepper
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1/4 teaspoon ground nutmeg
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1/4 teaspoon cayenne pepper