In a bowl combine the flour, baking soda and salt. Reserve
Whip the butter in a stand mixer bowl using the leaf attachment. Add all the sugar and mix until combined. You will want to scrape the bowl midway so it doesn’t clump.
Add the egg, lemon zest+juice and vanilla extract to the mix. Mix for a minute
Add half the flour and mix on low speed for a minute. Once combined, add the remaining flour. Mix until combined, do not overmix.
Transfer the dough to a plastic film and put it in the refrigerator for an hour (ideally 2).
Preheat oven to 375F
Transfer the icing sugar into a bowl
It’s now time to ball up the dough. Each cookie needs about 1 tablespoon of dough. Shape each piece into a ball. Dip each ball into the icing sugar and ensure it’s fully coated. While you don’t want to remove the coating, I strongly advise against leaving vast clumps of icing sugar as it will turn “wet”
Transfer the ball unto a baking tray covered with parchment paper. Make sure they are at least 2″ apart. Even a tad more is preferable.
Bake until the edge starts to brown a little ( in my oven its about 10 minutes )