In a stand mixer, cream butter and powdered sugar until well combined, add salt, mix well. Add vanilla, mix well. add flour and pecans. Mix until well combined.
Dough will be soft. Refrigerate at least 45 minutes to allow the dough to firm up.Preheat oven to 350 degrees. Form 1-1 1/2 inch balls. Place on a parchment lined cookie sheet.Bake for 10-12 minutes until bottoms are light brown. Cool on pan for 1 minute.Place on cooling rack, and then roll each cooking in additional powdered sugar to coat. Be careful, they will be warm. Roll through sugar a second time now or if you prefer before serving. Store in airtight tin.