INGREDIENTS
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8 ounces sharp cheddar cheese, coarsely grated (2 1/2 cups)
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4 ounces Monterey Jack cheese, coarsely grated (1 1/2 cups)
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1 1/2 ounces Parmigiano-Reggiano cheese, finely grated (1/2 cup)
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Two 12-ounce cans evaporated milk
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1 3/4 cups whole milk
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1/3 cup sour cream
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1 tablespoon Dijon mustard
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Kosher salt
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Black pepper
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1/2 teaspoon plus 1/8 teaspoon cayenne pepper (optional)
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1 pound elbow macaroni
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2 tablespoons unsalted butter
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1 teaspoon thyme leaves, minced