01 - Preheat the oven to 350°F and line two baking sheets with parchment paper.
02 - Whisk together the flour, baking soda, and salt in a medium bowl. Set aside.
03 - Beat the butter and sugar together in a large bowl until light and fluffy, about 2-3 minutes.
04 - Beat in the lemon zest, egg, lemon juice, and vanilla extract until fully incorporated.
05 - Gradually add the dry ingredients to the wet mixture, mixing just until combined.
06 - Scoop tablespoon-sized balls of dough and roll each in the extra sugar to coat.
07 - Place cookies 2 inches apart on prepared baking sheets.
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.