01 - Preheat oven to 350°F. Line baking sheets with parchment paper.
02 - Whisk together flour, baking powder, and salt in a medium bowl.
03 - Lightly crush dried lavender with lemon zest using a mortar and pestle or spice grinder to release aromatic oils. Set aside.
04 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, approximately 2 minutes.
05 - Mix in egg, vanilla extract, and lemon juice until fully incorporated.
06 - Fold the prepared lavender-lemon zest mixture into the batter.
07 - Gradually add dry ingredients to wet mixture, stirring until just combined. Avoid overmixing.
08 - Drop tablespoon-sized dough balls onto prepared baking sheets, leaving 2 inches of space between each cookie.
09 - Bake for 10 to 12 minutes until edges turn lightly golden.
10 - Allow cookies to rest on baking sheet for 2 minutes, then transfer to wire rack to finish cooling.