01 - Preheat the oven to 350°F and line two baking sheets with parchment paper.
02 - In a large bowl, beat the softened butter and sugar together until pale and fluffy, about 2–3 minutes.
03 - Beat in the egg, lemon juice, lemon zest, and vanilla extract until fully incorporated.
04 - In a separate bowl, whisk together the flour, baking soda, and salt until evenly distributed.
05 - Gradually add the dry ingredients to the wet mixture, mixing just until incorporated. Do not overmix.
06 - Scoop heaping tablespoons of dough. If desired, roll each ball in powdered sugar to coat evenly.
07 - Place dough balls 2 inches apart on the prepared baking sheets to allow for spreading.
08 - Bake for 9–11 minutes, or until edges are just set and centers look slightly underbaked.
09 - Let cookies rest on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.