2-3teaspoonsfresh lemon zest (from one large lemon)
Cookies:
1cup(227g)butter, softened to room temperature (not too soft!)
1 ½cups(318g)granulated sugar
1tablespoonfresh lemon zest (from one large lemon)
1largeegg
¼cupfresh lemon juice
½teaspoonvanilla extract
2 ¾ cups+ 2 tablespoons(409g)all-purpose flour (see note)
½teaspoonbaking soda
½teaspoonbaking powder
½teaspoonsalt
Instructions
For the lemon sugar, combine the sugar and zest in a bowl and rub the lemon zest into the sugar with your fingers until super fragrant and the zest and sugar are evenly and well combined. Set aside.
Preheat the oven to 350 degrees F. Line two large, rimmed baking sheets with parchment paper and lightly grease with cooking spray.
In the bowl of an electric stand mixer fitted with the paddle attachment or in a large bowl with a handheld electric mixer, cream together the butter, granulated sugar and lemon zest until lightly and fluffy, 3-4 minutes. Scrape down the sides of the bowl as needed.
Add the egg, lemon juice and vanilla and mix again for 1-2 minutes until the batter lightens in color. Scrape the sides of the bowl as needed. It will look a bit curdled; that's totally fine.
Add the flour, baking soda, baking powder and salt and mix until combined. Don't over mix - just mix until no dry streaks remain.
Scoop the cookie dough into rounded balls (about 2 tablespoons in size; I use my #40 cookie scoop).
Stir or crumble the lemon sugar to break up any clumps. Roll cookie dough balls in lemon sugar and place on the prepared baking sheets a couple inches apart (about 12 cookies per baking sheet).
Bake for 9-11 minutes until slightly crackly on top (don't over bake).
Let the cookies cool for a few minutes on the baking sheet before removing to a cooling rack to cool completely.
Notes
Flour:at my elevation (2,500) and with the added lemon juice to the recipe, the extra 2 tablespoons flour is really important. Depending on where you live (high elevation), you may need a few tablespoons more beyond that (3 cups flour total). I recommend baking one "tester" cookie first - if it flattens too much, stir in a bit more flour to the dough. Another Cookie Spreading Tip: if the cookies spread and flatten too much while baking, try adding more flour per the note above or increase the baking temperature to 375 degrees F or use convection bake (if you have that function on your oven – see my Instagram experiment here to come to this conclusion). Conversely, if your cookies are not spreading enough in the oven, try reducing the oven temperature to 325 degrees and/or measuring the flour with a lighter hand next time (or use a scale to weigh the ingredients).