Preparation: Heat the oven to 425°. Butter a 2 1/2- to 3-quart baking dish. Cook spaghetti or noodles according to package directions. Meanwhile, in skillet, melt 2 tablespoons butter over medium-low heat; sauté sliced mushrooms until golden. In a saucepan, melt 1/4 cup butter; stir in flour, and 1/2 teaspoon salt. Stir until smooth; add chicken broth and cream. Cook, stirring, until sauce is thickened. Add chicken, cooked mushrooms, and sherry; heat through. Place noodles or spaghetti in a buttered baking dish; pour on sauce. Top with Parmesan cheese and sprinkle with paprika. Bake at 425° for 15 to 20 minutes, until hot and bubbly.