Preheat oven to 400 degrees F
Line baking sheet with parchment paper or silicone mat
In a large bowl, beat together butter, ½ cup powdered sugar and vanilla until well combined
Mix in salt and flour until well combined
Stir in nuts
Shape dough into 1 inch balls and place on prepared baking sheets
Bake for 10-12 minutes or until lightly golden brown
Remove from oven and cool slightly, about 2-3 minutes, on a wire rack
Add powdered sugar to medium bowl
Roll cookies in powdered sugar and place on wire rack to cool completely
Store in airtight container