INGREDIENTS
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1 tablespoon vegetable oil
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4 strips bacon, cut into 1/4-inch pieces
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3 tablespoons unsalted butter, divided
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3/4 cup (about 1 medium) finely chopped sweet yellow onion
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2 tablespoons flour
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3 tablespoons dry white wine
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1 1/4 cups half-and-half
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1 1/2 teaspoons dried marjoram (or 3/4 teaspoon chopped fresh marjorarm)
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3/4 teaspoon chopped fresh thyme
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Pinch of red pepper flakes
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1/2 teaspoon freshly ground black pepper
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1/4 pound fresh, whole-milk mozzarella, cubed
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1/4 pound blue cheese (such as Stilton or Roquefort), crumbled
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1/4 pound Parmigiano-Reggiano, grated
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1/4 pound Gruyere, grated
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Kosher salt
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1/2 pound pasta, cooked, drained, and kept hot
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1/2 cup panko (or substitute regular bread crumbs)
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Chives or parsley, for garnish (optional)