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1. For the topping: Adjust oven rack to middle position and heat oven to 350 degrees. Mix bread crumbs, salt, and butter in small baking dish; bake until golden brown and crisp, 15 to 20 minutes. Cool to room temperature and mix with _ cup Parmesan in small bowl. Set aside.
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2. For the filling: Increase oven temperature to 450 degrees. Heat 2 tablespoons butter in large skillet over medium heat until foaming subsides; add mushrooms and onions and saut, stirring frequently, until liquid from mushrooms evaporates, 12 to 15 minutes. Season with salt and pepper to taste; transfer to medium bowl and set aside. Clean skillet.
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3. Meanwhile, bring 4 quarts water to a boil in large pot. Add 1 tablespoon salt and pasta and cook until al dente. Reserve _ cup cooking water, drain spaghetti, and return to pot with reserved liquid.
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4. Melt remaining 6 tablespoons butter in cleaned skillet over medium heat. When foam subsides, whisk in flour and cook, whisking constantly, until flour turns golden, 1 to 2 minutes. Whisking constantly, gradually add chicken stock. Turn heat to medium-high and simmer until mixture thickens, 3 to 4 minutes. Off heat, whisk in sherry, Parmesan, nutmeg, lemon juice, thyme, and _ teaspoon salt. Add sauce, sauted vegetables, peas, and turkey to spaghetti and mix well; adjust seasonings to taste.
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5. Turn mixture into buttered 9 by 13-inch gratin dish (or other shallow, ovenproof baking dish of similar size), sprinkle evenly with reserved bread crumbs, and bake until bread crumbs brown and mixture is bubbly, 13 to 15 minutes. Serve immediately.
