Cream together softened butter, lemon zest, granulated sugar, and confectioners' sugar. Add vanilla extract and almond extract, then beat in eggs one at a time. Stir in flour and baking powder.
Chill dough in the refrigerator for at least two hours.
Adjust oven rack to lower-middle position; heat oven to 400℉.
Use a medium cookie scoop to portion the dough. Roll each portion into uniform balls, then them in granulated sugar. and then flatten the balls using a flat-bottomed ramekin or glass to about ½ inch thick.
Arrange the sugar-coated dough balls on a parchment-line baking sheet. Then use a flat-bottomed glass or ramekin to flatten them to approximately ½-inch think.
Bake at 400℉ for 6-8 minutes, until just starting to brown around the edges.
Recipe Notes
* I do not add salt to this recipe, as the salt in salted butter is plenty. If you prefer to bake with unsalted butter, you may add 1 teaspoon of salt along with the flour and baking powder in step #3.