2In a medium bowl, cream butter and sugar until smooth. Stir in the egg yolk. Add the flour and nuts, mix until well blended. Stir in the potato chips last, so they don 't get too crunched up.
3Roll the dough into walnut sized balls. Place 2 inches apart on an unprepared cookie sheet. Bake for 10 to 12 minutes in the preheated oven. Remove from cookie sheet to cool on wire racks.