1.
For The Cookies:In a medium bowl, whisk together flour, baking powder, and salt; set aside. In the bowl of a stand mixer fitted with a paddle attachment, beat together butter and sugar until light and fluffy, about 3 minutes. Beat in egg, lemon juice, and lemon zest. Add dry ingredients and mix until just combined. Divide dough in two, wrap each section in plastic wrap, and refrigerate for 30 minutes.