01 - Beat softened butter and powdered sugar in a large bowl until light and fluffy, approximately 2-3 minutes.
02 - Incorporate fresh lemon juice, lemon zest, and vanilla extract until fully blended into the mixture.
03 - Mix in salt, flour, and cornstarch until a soft, cohesive dough forms.
04 - Divide dough in half and roll each portion into 1-inch diameter logs. Wrap tightly in plastic and refrigerate for minimum 30 minutes.
05 - Heat oven to 350°F. Line two baking sheets with parchment paper.
06 - Unwrap chilled dough and cut into 1/4-inch rounds. Arrange on prepared baking sheets with 1-inch spacing between cookies.
07 - Bake for 10-12 minutes until edges develop a pale golden color.
08 - Let cookies rest on baking sheets for 5 minutes. Gently roll warm cookies in powdered sugar to coat evenly.
09 - Transfer cookies to wire rack and cool entirely. Dust with additional powdered sugar before serving if desired.