Preheat your oven to 350 degrees F (175 degrees C). Line two cookie sheets with parchment paper and set aside.
In a large bowl, whisk together the flour, baking powder, baking soda and salt. Then set aside.
2 3/4 cups (344 g) all-purpose flour spooned and leveled, 1/2 tsp baking powder, 1/2 tsp baking soda, 1/2 tsp salt
In a large bowl cream together the butter and granulated sugar together with an electric mixer on high speed until fluffy, about two minutes.(You can also use a stand mixer fit with a paddle attachment.) 1 cup (200 g) granulated white sugar, 1 cup (224 g) unsalted butter, softened
Add in the egg, vanilla and lemon zest and mix on medium speed until pale in color and fluffy, 1-2 minutes.
1 egg, at room temperature, 1 tsp vanilla bean paste, 2 1/2 tbsp lemon zest
Slowly add in the dry ingredients. Mix on low speed just until the dough pulls together.
Scoop the dough into balls with a large cookie scoop. Roll into balls. Then, roll each cookie dough ball in the lemon sugar.
Place the dough on to parchment-lined cookie sheets and slightly flatten each ball. (Bake 6 cookies at a time.)
Bake the cookies for 9-10 minutes, then let them cool on the baking sheet for 5 minutes. Transfer the baked cookies to a cooling rack to finish cooling.(When the cookies are straight out of the oven, scoot a circular cookie cutter around them to give them a perfect circular shape.)