01 - Beat softened butter and powdered sugar in a large bowl until light and fluffy mixture forms.
02 - Blend in lemon juice, lemon zest, and vanilla extract until fully incorporated.
03 - Mix in salt, flour, and cornstarch until soft dough comes together.
04 - Divide dough in half, roll each portion into 1-inch diameter logs, wrap in plastic, and refrigerate for 30 minutes.
05 - Preheat oven to 350°F and line baking sheets with parchment paper.
06 - Unwrap dough, cut into 1/4-inch rounds, and place on prepared baking sheets 1 inch apart.
07 - Bake for 10-12 minutes until edges are lightly golden.
08 - Let cookies cool on baking sheets for 5 minutes, then gently toss in powdered sugar while warm.
09 - Transfer to wire rack to cool completely, then dust with additional powdered sugar before serving.