Mix flour with butter and nuts. Spread on cookie sheet and bake at 350 degrees until golden brown. Stir crumbs occasionally to ensure even browning. Cool. Spread crumbs evenly into a 9 X 13 baking dish. Smooth softened ice cream on crumbs and top with Cool Whip. Freeze.

To make sauce, mix butter, chocolate chips and whipping cream in sauce pan. Stir constantly until sauce is well blended. Top pie with sauce and serve.