01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the flour, baking powder, and salt. Stir in the chopped lavender and lemon zest.
03 - In a large bowl, cream the softened butter and sugar together until light and fluffy, about 2-3 minutes.
04 - Beat in the egg, vanilla extract, and lemon juice until well combined.
05 - Gradually add the dry ingredients to the wet mixture, mixing until just combined.
06 - Scoop tablespoon-sized portions of dough, roll into balls, then roll each ball in the additional granulated sugar to coat.
07 - Place the dough balls onto the prepared baking sheets, spacing them about 2 inches apart.
08 - Gently flatten each ball with the bottom of a glass.
09 - Bake for 10-12 minutes, until the edges are lightly golden.
10 - Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.