MIX flour, butter, powdered sugar and salt with an electric mixer until mixture resembles coarse crumbs. Press firmly and evenly into a greased jelly roll pan (15 x 10-inches).
BAKE 20 minutes at 350ºF until golden brown.
BEAT eggs, corn syrup, sugar, butter and vanilla in a large bowl until well blended. Stir in pecans.
POUR over hot crust; spread evenly.
BAKE 25 minutes at 350ºF until filling is firm around the edges and slightly firm in center.
COOL completely on wire rack before cutting.
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