Preheat oven to 350 degrees.

In the bowl of a mixer, beat the butter with the powdered sugar until fluffy. Add the vanilla and beat again to combine. Add the flour and salt and mix to form a thick dough. Lastly, add the chopped nuts and mix to incorporate.

Scoop and roll the dough into 1-inch balls and arrange on a baking sheet. They won’t spread much. Bake for about 15 minutes, until cookies are just barely browned on the bottoms. Remove from oven, cool for about 5 minutes, then roll in a bowl of powdered sugar to coat. Allow the cookies to cool completely, then roll in the second layer of powdered sugar.