These quick and easy Lemon Poppy Seed Cookies are inspired by the classic muffin or quick bread but in a chewy cookie form! In just an hour, make a total crowd-pleaser that all ages will love!
Heat oven to 350ºF with rack in the center. Line baking sheets with parchment and set aside.
*In a small saucepan over medium-high heat, simmer lemon juice until it has reduced in amount by half, to ¼ cup (or 4 tablespoons). You can check by pouring it into a liquid measuring cup and returning it to the pan. Remove from heat and add the butter to the pan. Let the butter melt, stirring occasionally to combine the butter and concentrated lemon juice. Cool the mixture to room temperature.
In a bowl whisk together the flour, baking powder, baking soda, salt, and poppy seeds. Set aside.
In the bowl of an electric mixer fitted with the paddle attachment, combine the cooled melted butter and lemon mixture, sugar, egg yolk, egg, and lemon extract. Beat until well combined and lightened slightly, about 2 minutes. Stir in the flour mixture and mix until just incorporated and a dough forms.
Use a 2-tablespoon cookie scoop to make balls of dough and roll them in a bowl of extra granulated sugar. Place on prepared baking sheets about 2-inches apart. Use the bottom of a glass or measuring cup to flatten the cookies slightly. Dip the bottom of the glass into the sugar after each press.
Bake cookies until they are set and just starting to brown around the bottom edges, 9 to 10 minutes. Cool 2 to 4 minutes on the cookie sheet then remove to a wire rack to cool completely.
Cooled cookies can be stored in an airtight container for up to 4 days.