📖 Instructions

1. Before you begin, ensure your butter is at room temperature. This is crucial for achieving that light, fluffy texture when creaming. Also, line two baking sheets with parchment paper or silicone mats; this prevents sticking and helps with even baking.
2. In a large mixing bowl, using an electric mixer (either a stand mixer with a paddle attachment or a hand mixer), cream together the softened unsalted butter and granulated sugar on medium speed. Beat for about 2-3 minutes, until the mixture becomes wonderfully light, pale, and fluffy. Make sure to stop and scrape down the sides of the bowl with a rubber spatula once or twice to incorporate all the butter and sugar evenly.
3. Next, beat in the large egg and the vanilla extract. Continue mixing until everything is just combined. Be careful not to overmix at this stage; we want to keep some air in the mixture for tender cookies. Scrape down the bowl again if needed.
4. In a separate medium bowl, whisk together the all-purpose flour, baking powder, and salt. Then, slowly add this dry ingredient mixture to the wet ingredients in the large bowl. Mix on low speed until the flour is just incorporated. The dough should come together but might still look a little crumbly. Try not to overmix, as this can lead to tough cookies!
5. Now for the citrus punch! Add the lemon zest and orange zest to the dough. Mix on low speed for just about 30 seconds, until the zest is evenly distributed throughout the dough. The kitchen should start smelling amazing right about now.
6. Divide the dough in half. Shape each half into a flat disk, wrap tightly in plastic wrap, and refrigerate for at least 30 minutes. This chilling step is super important—it helps firm up the butter, prevents the cookies from spreading too much, and deepens the flavors. Don't skip it, even if you're in a hurry!
7. While the dough is chilling, preheat your oven to 375°F (190°C). This ensures your oven is perfectly hot when the cookies go in, promoting even baking.
8. Once chilled, remove one disk of dough from the fridge (keep the other one chilled until ready to roll). Lightly flour your work surface and your rolling pin. Roll out the dough to about 1/4 inch thickness. The dough should be smooth and easy to work with, but if it's too sticky, dust with a little more flour. If it gets too warm, pop it back in the fridge for a few minutes.
9. Use a 2-inch round cookie cutter to cut out your cookie shapes. Gently transfer the cut-out dough circles to your prepared baking sheets, leaving about 1 inch between each cookie. Re-roll any dough scraps and continue cutting until all the dough is used.
10. Bake for 8-10 minutes, or until the edges are just set and very lightly golden. The centers might still look a little soft, and that's okay! Overbaking will make them dry and hard. For a chewy cookie, aim for the shorter baking time. For a crispier edge, lean towards the longer time.
11. Once baked, immediately transfer the cookies from the hot baking sheet to a wire rack to cool completely. This prevents them from becoming soggy on the bottom and allows air to circulate, ensuring a nice texture.
12. While the cookies are cooling, prepare the glossy topping. In a small bowl, whisk together the powdered sugar, fresh lemon juice, fresh orange juice, and a tiny pinch of salt until you have a smooth, pourable glaze. If it's too thick, add a few more drops of juice; if too thin, add a little more powdered sugar. You want a consistency that coats the back of a spoon and drips off slowly.
13. Once the cookies are completely cool, dip the top of each cookie into the glaze, letting any excess drip off back into the bowl. Alternatively, you can spoon the glaze over the cookies. Place the glazed cookies back on the wire rack with parchment paper underneath to catch any drips.
14. If you wish, sprinkle a little extra lemon or orange zest over the wet glaze for a pop of color and extra citrus aroma. Let the glaze set completely for about 30-60 minutes before stacking or storing the cookies. This ensures the topping is firm and glossy.