Preheat oven to 350°. In a large bowl, cream butter and sugar until light and fluffy. Beat in egg and vanilla. Gradually beat in flour. Stir in pecans and 1 cup potato chips. , Drop by tablespoonfuls 1-1/2 in. apart onto ungreased baking sheets. Flatten with a fork. If desired, top cookies with additional chips., Bake 12-14 minutes or until golden brown. Remove from pans to wire racks to cool.