Preheat oven to 350 degrees

In stand mixer cream butter and powdered sugar. Turn to low and mix in salt, vanilla, flour and pecans. Roll into one inch balls. Place on parchment covered baking sheets a few inches part. Bake for 11 minutes. Do not over bake

Remove from oven and allow to cool just enough to handle them. Pour 1 cup powdered sugar in large Ziploc bag. Gently add 3-4 cookies at a time and roll them gently in the bottom of the bag. Use fork to scoop under each cookie and gently shake to remove excess powdered sugar. Place on cooling racks. Once completely cooled roll in powdered sugar bag again