INGREDIENTS
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1/2 lb elbow macaroni
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1 1/2 tablespoon unsalted butter
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2 tablespoons unbleached all-pupose flour
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1 cup whole milk
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4 oz aged white cheddar cheese, grated
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4 oz Gruyère, grated
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2 extra large egg yolks
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1/4 cup freshly grated Parmigiano-Reggiano Cheese
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1/4 cup Panko crumbs
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pinch of Kosher salt