Preheat oven to 325°F and place a sheet of parchment paper on a cookie sheet.
In a large bowl, cream butter and gradually add the 2/3 cup of powdered sugar and salt until light and fluffy.
Stir in the pecans and vanilla. Gradually add the flour, and mix well.
Drop dough by the rounded teaspoon onto the prepared cookie sheet. Bake for 17-20 minutes. Do not brown.
Let cookies cool for 1 to 2 minutes, then roll the cookies in a shallow bowl of powdered sugar. Then, repeat for an additional coating.
Serving Size 1 cookie