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in bowl, cream butter and powdered sugar.then add vanilla.mix well.
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gradually add flour, mix well to combine --
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cover and refrigerate 30 minutes --
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roll into 1" balls.
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Place 2" apart on ungreased cookie sheet.using the end of a wooden spoon handle.make an indentation in center of each cookie --
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bake at 350* for 12-14 minutes or lightly browned --
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remove to rack to cool completely.
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to prepare FILLING:.
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combine sugar, cornstarch, lemon zest and salt in saucepan --
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stir in beaten egg, lemon juice and butter till smooth.
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cook over medium heat till thickened.
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reduce heat, cook and stir 2 minutes.
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cool.
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spoon 1/2 tsp of filling into each cookie.
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dust with powdered sugar.