First, preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large bowl, cream together the butter, powdered sugar, and vanilla extract until light and fluffy.
In a separate bowl, whisk together the flour and salt, then gradually add this dry mixture to your butter mixture.
Fold in the chopped nuts until everything is well combined, being careful not to overmix.
Shape the dough into 1-inch balls and place them about an inch apart on your prepared baking sheet.
Bake for 10-12 minutes until the bottoms are lightly browned but the tops remain pale.
While still warm (but not hot), roll the cookies in additional powdered sugar, then allow them to cool completely before rolling a second time for that signature snowy coating.
