Preheat oven to 350°.

Cream butter and sugar in a large mixing bowl until light and fluffy. Add vanilla and beat in well.

Combine flour and salt if using and whisk together.

Gradually add flour mixture to creamed mixture and mix well. Stir in potato chips and toasted pecans.

Roll into 1 inch balls and place 2 inches apart on cookie sheets. Flatten slightly with a glass (if it sticks; rub a bit of butter on the bottom).

Bake 10-12 minutes or until very lightly browned.

Remove from the oven and cool 2 minutes before removing from cookie sheet.

Put confectioners sugar into a wide bowl and dust cookies all over with sugar.

Allow to cool completely on a wire rack.