Chicken Tetrazzini

1/4 cup margarine
1/4 cup flour
1 can mushrooms drained (sliced)
1/2 cup grated parmesan cheese
1/2 teaspoon salt
1/4 teaspoon pepper
1 cup chicken broth
2 tablespoons sherry
1 cup cream
7 ounces spaghetti (cooked)
2 cups boned chicken (cooked)

Melt butter in large saucepan over low heat. Blend in flour, salt and pepper. Add broth and cream. Heat to boiling stirring constantly. Boil stirring 1 minute. Stir in sherry, spaghetti, mushroom and chicken. Pour in 2 quart ungreased casserole dish. Sprinkle with cheese. Bake at 350 degrees for 30 minutes.