Mix 1⅓ c. fine vanilla wafer crumbs, about 24 (2") wafers, with ¼ c. soft butter or margarine until crumbly. Press on bottom and sides of 8" or 9" pie pan, reserving 3 tblsp. mixture to sprinkle on top of pie, if desired. Bake in moderate oven (375°F.) 8 minutes, or until edge is lightly browned.