01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper and set aside.
02 - In a medium bowl, whisk together the flour, baking soda, and salt until well blended. Set aside.
03 - In a large bowl, beat the butter and sugar together using a hand or stand mixer until light and fluffy, approximately 2-3 minutes.
04 - Beat in the lemon zest, egg, lemon juice, and vanilla extract until fully incorporated into the butter mixture.
05 - Gradually add the dry ingredients to the wet mixture, mixing on low speed just until combined. Do not overmix.
06 - Sop tablespoon-sized balls of dough and roll each in the extra sugar to coat evenly.
07 - Place cookies 2 inches apart on prepared baking sheets to allow for spreading.
08 - Bake for 9-11 minutes, until edges are lightly golden and centers are just set.
09 - Allow cookies to cool on the sheet for 5 minutes before transferring to a wire rack to cool completely.