01 - Pulse granulated sugar and fresh lilac blossoms in a food processor until flowers are finely chopped and sugar becomes fragrant with pale purple hue. Reserve mixture for dough preparation.
02 - Whisk together all-purpose flour, baking powder, and salt in a medium bowl until uniformly blended. Set aside for later incorporation.
03 - Beat room-temperature unsalted butter and prepared lilac sugar in a large bowl until mixture appears light and fluffy, approximately 2-3 minutes.
04 - Add whole egg and vanilla extract to creamed mixture, beating until fully combined and smooth in texture.
05 - Gradually blend dry ingredient mixture into wet mixture, mixing only until flour is just incorporated. Avoid overmixing to prevent tough cookies.
06 - Divide dough into two equal portions, shape each into flat discs, wrap tightly in plastic wrap, and refrigerate for minimum 1 hour to firm.
07 - Preheat oven to 350°F. Line baking sheets with parchment paper to prevent sticking during baking process.
08 - Roll chilled dough on lightly floured surface to 1/4 inch thickness. Cut into desired shapes using cookie cutters, dipping in flour between cuts to prevent sticking.
09 - Arrange cut cookies on prepared baking sheets. Bake for 8-10 minutes until edges turn just golden brown. Centers should remain slightly soft.
10 - Let cookies rest on baking sheets for 5 minutes before transferring to wire rack. Cool completely to room temperature before serving or storing.