In a medium mixing bowl stir together the flour, sugar, and salt.
Cut in butter until mixture resembles a fine crumbs.
Sprinkle with vanilla.
Form the mixture into a ball I need until smooth.
Spray a shortbread mold with nonstick cooking spray or brush with oil.
Firmly pressed the dough into the mold.
Invert the mould over a lightly greased baking sheet and tap the mold lightly to release the dough onto the baking sheet.
If necessary use a knife to pry the dough out of the mold.
Or, pat the dough into an 8-inch circle on a lightly greased baking sheet.
With a fork, prick dough deeply to make eight or 16 wedges.
Bake in a preheated 325° oven for about 25 minutes or till center of shortbread is set.
While still warm, cut molded shortbreads into wedges.
Remove shortbread from baking sheet and cool completely on rack.
If desired, sprinkle wedges with confectioners sugar