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Creamed Haricot Vert and Corn Casserole

  • ACTIVE: 45 MIN
  • TOTAL TIME: 1 HR 30 MIN
  • SERVINGS: 12
  • MAKE-AHEAD
  • VEGETARIAN

Chef Naomi Pomeroy of Beast in Portland, Oregon, makes this casserole with chanterelle mushrooms and homemade bread crumbs. This adaptation calls for easier-to-find oyster mushrooms and packaged panko.

  1. 1 1/2 pounds haricots verts, cut into 1 1/2-inch lengths
  2. 1 stick plus 2 tablespoons unsalted butter
  3. 1 1/2 pounds oyster mushrooms, thickly sliced
  4. Salt and freshly ground pepper
  5. 1 large sweet onion, very finely chopped
  6. 4 garlic cloves, minced
  7. Two 10-ounce packages frozen corn, thawed (4 cups)
  8. 1/2 cup all-purpose flour
  9. 1 quart whole milk
  10. 6 ounces Gruyère cheese, shredded (1 1/2 cups)
  11. Freshly grated nutmeg
  12. 1/2 cup panko (Japanese bread crumbs)
  13. 1/2 cup freshly grated Parmigiano-Reggiano cheese
  1. Preheat the oven to 350°. In a pot of boiling salted water, blanch the haricots verts until crisp-tender, about 2 minutes. Drain and cool under running water. Pat dry.
  2. In a very large, deep skillet, melt 4 tablespoons of the butter. Add the mushrooms, season with salt and pepper and cook over moderately high heat, stirring frequently, until lightly browned, 6 to 7 minutes. Add the onion and garlic and cook over low heat, stirring occasionally, until softened, about 5 minutes. Add the corn and cook, stirring occasionally, until the mixture is dry and the corn is just beginning to brown, about 5 minutes. Add the haricots verts and keep warm.
  3. In a large saucepan, melt the remaining 6 tablespoons of butter. Add the flour and whisk over moderate heat until fragrant and lightly browned, about 4 minutes. Whisk in the milk until smooth and bring to a boil. Reduce the heat to moderately low and simmer, whisking constantly, until very thick, about 5 minutes. Remove from the heat. Stir in the Gruyère and season with salt, pepper and nutmeg. Pour the sauce over the vegetables and stir well. Pour the mixture into a 4-quart baking dish.
  4. In a small bowl, combine the panko with the Parmigiano and sprinkle over the vegetables. Set the baking dish on a rimmed baking sheet and bake in the center of the oven for 30 minutes, until bubbling. Turn on the broiler and broil the casserole for 3 to 4 minutes, until the top is golden and crisp. Let the casserole rest for 10 minutes before serving.
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