Prepare 2 baking sheets by lining with parchment paper.
In a medium bowl, whisk together flour, baking soda, salt and lemon zest.
Using a stand-mixer with the paddle attachment, begin mixing together butter and granulated sugar until light and fluffy (approximately 2 - 4 minutes on medium speed). Scrape sides of bowl as needed. Note: a hand mixer may also be used.
Add egg and lemon juice. Mix on medium speed until well combined. Scrape sides of bowl as needed.
Add the flour mixture and mix on low speed until combined.
Scoop dough onto the parchment-lined baking sheets using a small cookie scoop (approximately 1 ½ tablespoon per cookie). Leave approximately 2 inches of space between each cookie.
Bake cookies for 10 - 12 minutes or until tops are a pale golden color.
Let cookies cool on the baking sheets for 5 to 10 minutes, then transfer them to a wire rack to cool completely.