01 - Beat softened butter and powdered sugar in a large bowl until mixture becomes pale and fluffy, approximately 2-3 minutes.
02 - Fold in lemon zest, chopped lavender, and salt until evenly distributed throughout the creamed mixture.
03 - Gradually blend in flour, mixing until dough just forms and no dry flour streaks remain visible.
04 - Divide dough into two equal portions. Form each into a 2-inch diameter log, wrap securely in plastic wrap, and refrigerate for minimum 30 minutes until firm.
05 - Preheat oven to 350°F. Line two baking sheets with parchment paper and set aside.
06 - Cut chilled dough logs into 1/4-inch thick rounds. Place cookies on prepared baking sheets, leaving slight space between each for expansion.
07 - Bake for 14-16 minutes until edges turn light golden brown. Allow cookies to rest on baking sheets for 5 minutes before transferring to wire rack to cool completely.
08 - Whisk together sifted powdered sugar, lemon juice, and lemon zest until smooth and glossy. Adjust consistency with additional lemon juice if needed.
09 - Drizzle or spread icing over cooled cookies. Garnish with dried lavender buds if desired. Let icing set completely before serving.