01 -
Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 -
Whisk together flour, baking powder, and salt in a small bowl. Set aside.
03 -
In a large bowl, use an electric mixer fitted with the paddle attachment to beat together the butter, sugar, and lemon zest until light and fluffy, about 3 to 4 minutes. Scrape down the bowl.
04 -
Beat in the egg until very well combined, about 1 minute. Scrape down the bowl.
05 -
On low speed, add the flour mixture and blend until just incorporated. Dough will be slightly dry.
06 -
Using a medium spring-loaded cookie scoop, drop 1 ½-tablespoon sized balls of cookie dough onto prepared baking sheets, spacing 2 inches apart. Roll each ball with your palms, then gently flatten using your palm to about 1/3-inch thick.
07 -
Bake for 12-14 minutes or until cookies are just set and slightly golden brown at the edges. Cool cookies on baking sheet for 5 minutes and transfer to cooling racks. Allow to cool completely.
08 -
In a medium bowl, whisk together powdered sugar and lemon juice, a tablespoon at a time, until a very thick but pourable glaze forms.
09 -
Spoon the glaze over each cookie. Garnish with extra lemon zest, if desired. Let cookies sit until the icing has set, at least 30 minutes.