INGREDIENTS
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Unsalted butter, for the baking dish
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1 tablespoon olive oil
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1 (1-inch-thick) slice pancetta, cut into small dice
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4 cloves garlic, finely chopped
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3 tablespoons all-purpose flour
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5 cups whole milk, or more if needed, hot
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4 large egg yolks, lightly whisked
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2 teaspoons finely chopped fresh thyme leaves
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1/2 teaspoon cayenne pepper
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2 cups (8 ounces) grated Asiago cheese, plus more for the top
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1 1/2 cups (6 ounces) grated Irish white cheddar, plus more for the top
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1 1/2 cups (6 ounces) grated American cheddar, such as Goot Essa Mountain Valley, plus more for the top
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1 cup (4 ounces) grated aged fontina cheese, plus more for the top
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1/2 cup freshly grated Parmesan cheese, plus more for the top
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Kosher salt and freshly ground black pepper
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1 pound elbow macaroni, cooked just under al dente
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1/2 cup coarsely chopped fresh flat-leaf parsley leaves