Add flour, sugar, salt, butter and vanilla to mixing bowl and blend until smooth.
Add pecans and blend until well distributed.
Preheat oven to 350 degrees. Roll dough into small golf ball size cookies and place on lightly greased cookie sheet. Place as many as you can on a sheet, as they will not flatten, but will remain round. Bake for close to 20 minutes.
Take out of oven and put cookies in bowl with powered sugar and allow the cookies to cool in the sugar.