01 - Cream softened butter and powdered sugar in large bowl until light and fluffy, approximately 2-3 minutes.
02 - Mix in lemon juice, lemon zest, and vanilla extract until fully incorporated into butter mixture.
03 - Add salt, flour, and cornstarch. Mix on low speed until soft dough forms and no dry streaks remain.
04 - Divide dough in half. Roll each portion into 1-inch diameter logs. Wrap in plastic and refrigerate 30 minutes or until firm.
05 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
06 - Unwrap chilled dough. Slice into 1/4-inch rounds. Place cookies 1 inch apart on prepared baking sheets.
07 - Bake 10-12 minutes until edges are barely golden. Centers should remain pale for tender texture.
08 - Let cookies cool on sheets 5 minutes. Gently toss warm cookies in powdered sugar until evenly coated.
09 - Transfer cookies to wire rack. Cool completely before serving. Dust with additional powdered sugar for extra presentation.