Melt butter in large saucepan over low heat. Blend in flour and seasonings. Cook over low heat, stirring until mixture is smooth and bubbly. Remove from heat. Stir in broth and cream. Heat to boiling, stirring constantly. Boil and stir 1 minute. Stir in sherry, spaghetti, turkey, and mushrooms. Pour into ungreased 2-quart casserole. Sprinkle with cheese. Bake uncovered 30 minutes or until bubbly. Brown lightly under broiler. |