Cook potatoes until tender. Slice or quarter leaving skin on. Put into greased 9x13 pan. Combine sour cream, dressing, bacon, parsley and 1 cup shredded cheese. Pour over potatoes and mix gently. Top with 1/2 cup shredded cheese. Combine cornflakes and butter; sprinkle over casserole. Bake at 350 for 45 minutes.