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Preheat oven to 400. Bring a large pot of salted water to a boil (for pasta). In a large saucepan, melt 2 tablespoons butter over high heat. Add mushrooms, and season with salt and pepper. Cook, tossing frequently, until tender and browned, 8 to 10 minutes. Transfer to a bowl, and set aside.
Make sauce: In same saucepan, melt remaining 4 tablespoons butter over medium heat. Add flour; cook, whisking, about 1 minute. Whisking constantly, gradually add milk, broth, and wine. Bring to a boil; reduce to a simmer, and add 2 cups Parmesan and thyme. Season with salt and pepper.
Cook pasta 2 minutes less than package instructions for al dente; drain and return to pot. Add sauce, chicken, peas, and mushrooms. Toss well to combine. Divide between two shallow 2-quart baking dishes; sprinkle with remaining Parmesan. Freeze (see below) or bake until browned, about 30 minutes. Let stand 10 minutes before serving.