Step 1

Make the Cookie Dough: In a medium bowl, whisk the flour, cornstarch, baking powder, baking soda, and salt. Set aside.

Step 2

In a large mixing bowl, beat the butter, sugar, and lemon zest with an electric mixer on medium speed until light and fluffy, about 2-3 minutes.

Step 3

Reduce the speed to low and blend in the egg, yolk, vanilla extract, and lemon juice, one at a time, until well combined.

Step 4

Gradually mix in the dry ingredients until just incorporated. Then, cover the dough with plastic wrap and refrigerate for about 30 minutes.

Step 5

Preheat the oven to 350°F. Line two baking sheets with parchment paper.

Step 6

Portion the dough into 1 tablespoon-sized balls and arrange on the baking sheets 2 inches apart.

Step 7

Bake for 10-12 minutes or until the edges are just beginning to turn golden. Let the cookies cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

Step 8

Make the Glaze: In a small bowl, whisk the powdered sugar, lemon juice, and salt until smooth. If needed, add more powdered sugar or lemon juice to adjust the consistency.

Step 9

Drizzle or spoon the lemon glaze over the cookies, letting it drip down the sides. While the glaze is still wet, sprinkle a small pinch of fresh lemon zest on each cookie.

Step 10

Let the glaze set for about 20-30 minutes before serving. Enjoy!