Preheat oven to 325.
Chop nuts in food processor to finely chop.
In a bowl, cream butter, salt and 1/2 cup powdered sugar together until fluffy.
Add in nuts and vanilla and beat until blended.
Slowly add in flour, mixing well.
Shape into 1/2-3/4" balls.
Place on ungreased cookie sheet.
Bake for 18 minutes.
Allow to cool before removing from cookie sheet.
Fill a zippered bag with remaining powdered sugar.
Gently shake each cookie in bag so it is well coated.