Cook mushrooms in butter until tender-3 to 4 minutes. Set aside. Cut breasts in half and pound thin, season with salt and pepper. Dredge chicken in flour and sauté in butter until lightly browned. Place chicken in lightly greased baking dish. To reserved drippings in pan, add broth and wine. Bring to boil, reduce heat and simmer, stirring occasionally, for 10 minutes. Season with salt and pepper. Pour sauce over chicken. Place mushrooms on top and sprinkle with cheeses. Bake in oven at 450 degrees for 12 - 14 minutes until cheese is melted and chicken is thoroughly cooked. Garnish with chopped parsley or chives.