Cream the butter with 1/2 cup of the confectioners' sugar and the vanilla. Mix in the flour, pecans, and salt. Roll about 1 Tablespoon or so of dough into balls and place on a parchment lined cookie sheet.
Bake in preheated oven until bottoms are golden, about 15 minutes. Do not allow these cookies to over cook or get to brown: it's better to undercook them than overcook them.
While cookies are still hot, using a fork, roll them in additional confectioners' sugar. Place on cooling rack. Once they have cooled, roll them in confectioners' sugar once more. This recipe makes 3 dozen cookies.
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Notes
You can also roll them in crushed candy canes for the Holidays.