Directions

1. Preheat oven to 425 degrees. In a bowl, combine breadcrumbs, 1/4 cup cheese, and 3 tablespoons butter. Season with salt; set aside.
2. In a medium saucepan over medium-high heat, toss 1 tablespoon butter with onion, mushrooms, and 1 teaspoon salt. Cover; cook 3 minutes. Remove lid; cook, stirring, 3 minutes more. Transfer to a bowl; add turkey and peas. Set aside. In same pan, whisk stock, remaining butter, and flour. Bring to a boil; reduce heat to a simmer. Whisk until thick, 4 to 5 minutes. Remove from heat; stir in lemon juice, thyme, and remaining 1/2 cup cheese. Season with salt and pepper. Combine sauce, turkey, and noodles in a 9-by-13-inch baking dish; top with breadcrumbs. Bake until golden and bubbling, 13 to 15 minutes. Serve warm.