Start by gathering all the ingredients listed above. Make sure the butter is softened at room temperature for easy mixing.
Preheat your oven to 350°F (175°C). This ensures your cookies bake evenly.
In a large mixing bowl, use an electric mixer to cream together the softened unsalted butter and granulated sugar until the mixture is light and fluffy.
Add the two large eggs and the tablespoon of vanilla extract to the mixture. Beat until everything is well combined.
In a separate bowl, whisk together the all-purpose flour, baking powder, salt, and Earl Grey tea leaves. This helps to evenly distribute the baking powder and tea throughout the flour.
Gradually add the dry ingredients to the wet mixture, stirring until just combined. Be careful not to overmix, as it can affect the texture of your cookies.
Using a cookie scoop or tablespoon, drop spoonfuls of dough onto a baking sheet lined with parchment paper, leaving some space between each cookie.
Bake in the preheated oven for 10-12 minutes, or until the edges are lightly golden. The centers may look slightly underbaked, but they will firm up as they cool.
Remove the cookies from the oven and let them cool on the baking sheet for about 5 minutes. Then, transfer them to a cooling rack to cool completely.
In a small bowl, mix the powdered sugar with the lemon juice until smooth. Drizzle over the cooled cookies for an added burst of flavor.