Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/2  cup           butter
     1/4  cup           flour
   3      cups          chicken broth
     1/2  cup           sherry
     1/2  cup           heavy cream
     1/2  teaspoon      oregano
     1/2  cup           parmesan cheese
   2      tablespoons   olive oil
   2      cloves        garlic -- minced
   1      cup           scallions -- sliced
     1/4  cup           fresh parsley -- chopped
  12      ounces        mushrooms -- sliced thin
  12      ounces        spaghetti
   2      cups          cooked turkey
                        salt

Preparation:

Melt 1/4 cup butter in a heavy saucepan. Stir in flour and cook 1 to 2 minutes, but do not brown. Add broth, sherry, cream, and oregano. Cook, stirring constantly, until sauce comes to a boil. Add 1/4 cup Parmesan cheese, stirring until melted. Remove from heat and set aside. Melt remaining butter with oil in skillet. Add garlic, scallions, parsley, and mushrooms and sauté‚until mushrooms are brown. Remove from heat. Cook spaghetti according to package directions until al dente. Drain well. Combine sauce, mushrooms, spaghetti, and turkey; season with salt to taste. Pour into greased casserole and sprinkle with remaining cheese. Bake at 375F for 15 minutes, or until bubbly.