Beat together the white sugar and the lemon zest with a hand or stand mixer in a large mixing bowl until fragrant, about 1 minute.
½ cup granulated white sugar, ½ tablespoon lemon zest
Add in the butter and beat together until well creamed. Mix in the egg yolk and beat until combined.
½ cup (1 stick) salted butter, 1 large egg yolk
Beat in the flour and cornstarch on high until a crumbly dough forms. Pour in the lemon juice and beat on low speed until a firm dough forms.
1¼ cup all-purpose flour, 1 teaspoon cornstarch, 1 Tablespoon lemon juice
Using a 1 ½ Tablespoon cookie scoop, scoop out dough and split it in half. Roll each half of dough into a ball.
Place each cookie ball on the prepared baking sheets, about 1 inch apart and flatten slightly with the bottom of a glass or measuring cup.
Loosely cover the dough with plastic wrap and place in the refrigerator to chill for 30-60 minutes or until firm through.
Preheat the oven to 350 degrees Fahrenheit and line 2 large baking sheets with parchment paper or spray lightly with baking spray.
Remove a baking sheet from the refrigerator and remove the plastic wrap.
Bake the cookies, one sheet at a time, for 9-12 minutes or until the edges of the cookies begin to brown.
While the cookies are baking, whisk together the powdered sugar and lemonade powder until fully combined.
1 cup powdered sugar, ¾ teaspoon lemonade kool aid powder
Allow the warm cookies to cool for 1-2 minutes and then dip each one in the powdered sugar mix to fully coat it.
Return the cookie to the tray and let it cool completely.
Once cooled, recoat each cookie in the powdered sugar mixture and then serve.
Notes
Storage:
To Store: Store your Lemon Cooler Cookies in an airtight container or bag at room temperature for up to 3-4 days. If the weather is warm or humid, consider storing them in the refrigerator to maintain freshness, though that may cause them to dry out slightly.
To Freeze: Lemon Cooler Cookies can be frozen for 2-3 months. Be aware that storing them for too long may cause the powdered sugar coating to absorb moisture from the cookies, potentially altering the texture and making the outside sticky. I recommend recoating them with powdered sugar to refresh the appearance before serving.
Tips:
Swap The Citrus: One of my favorite things to do with this recipe is to change the type of citrus fruit flavor that I use. Orange or lime can be substituted for the zest, juice and kool aid coating and will give delicious results.
Don't Love Lemon? You can omit the citrus flavoring completely and use water, milk or cream to get the cookies to come together. Consider adding a teaspoon of vanilla for flavor as well.
Cut The Calories: While these cookies cannot be considered diet food, using a packet of True Lemon powder has less calories than Kool-Aid! One packet equals the taste of 1 lemon wedge, has 0 calories, 0g sugar, and has no artificial colors or preservatives.