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Servings:
6
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Ingredients

Ingredient Checklist

Directions

Instructions Checklist
  • Bring a large pot of water to a boil, salt it, add the pasta and cook according to package directions until al dente; drain.

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  • While the pasta is working, heat a large, deep skillet over medium-high heat. Add the butter to melt, then add the onions, bay leaf and thyme; season with salt and pepper. Cook, stirring occasionally, until the onions are light caramel in color, 15 to 20 minutes.

  • Preheat the broiler. Discard the bay leaf. Stir the flour into the onion mixture. Stir in the milk and beef stock and bring to a boil. Cook, stirring, until thickened, about 2 minutes. Remove from the heat and stir in 1 1/2 cups cheese until melted, then stir in the mustard.

  • Add the pasta to the sauce and toss. Spoon into a 9-by-13-inch casserole dish, top with the remaining 1 cup cheese and broil until brown, 2 to 4 minutes. Top with the chives and serve immediately.

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