01 - Preheat oven to 350°F. Line baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, and salt until thoroughly blended.
03 - Using a mortar and pestle or spice grinder, lightly crush the dried lavender with lemon zest to release essential oils; set aside.
04 - In a large bowl, cream butter and sugar until light and fluffy, approximately 2 minutes.
05 - Beat in the egg, vanilla extract, and lemon juice until the mixture is well combined and smooth.
06 - Mix in the prepared lavender-lemon zest mixture until evenly distributed throughout the batter.
07 - Gradually add the dry ingredients to the wet ingredients, mixing until just incorporated. Be careful not to overmix.
08 - Scoop tablespoon-sized balls of dough onto prepared baking sheets, spacing them 2 inches apart to allow for spreading.
09 - Bake for 10 to 12 minutes, or until edges are lightly golden.
10 - Let cool on the baking sheet for 2 minutes, then transfer to a wire rack to cool completely.