Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a large bowl, cream together the softened butter and sugar until light and fluffy.

Beat in the egg, then add the lemon juice, lemon zest, and dried lavender, mixing until well combined.

In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add this dry mixture to the wet mixture, stirring until just combined.

Drop tablespoon-sized balls of dough onto the prepared baking sheet, leaving space between each.

Bake for 10-12 minutes or until the edges are lightly golden.

Let cool on the baking sheet for a few minutes before transferring to a wire rack.

For the glaze, mix powdered sugar and lemon juice until smooth, then stir in dried lavender.

Drizzle the glaze over the cooled cookies and allow it to set before serving.