sliced 4 tablespoons flour 1/4 teaspoon dry mustard 1 teaspoon salt 2 1/2 cups nonfat chicken broth 2 cups cream 1/4 cup chives -- chopped 1/4 cup sherry sour cream & flat-leaf parsley -- garnish Melt butter in large saucepan over medium heat. Add mushrooms and saute until j ust tender. Add flour, mustard and salt, stirring constantly for one minute or less. Flour should not brown or burn. Add broth and cook uncovered until mixtur e thickens. Stir in cream gradually and add chives. Heat thoroughly but do not boil. Add sherry just before serving. Garnish with sour cream and top with a sprig of parsley.