01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together flour, baking powder, and salt in a medium bowl. Set aside.
03 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, approximately 2-3 minutes.
04 - Beat in eggs one at a time, mixing well after each addition. Add Limoncello, lemon zest, and vanilla extract; mix until fully incorporated.
05 - Gradually mix in dry ingredients until a soft, cohesive dough forms.
06 - Drop dough onto prepared baking sheets using a tablespoon or small cookie scoop, spacing cookies 2 inches apart.
07 - Bake for 10-12 minutes until edges are lightly golden. Cool on baking sheet for 2 minutes, then transfer to wire rack to cool completely.
08 - Whisk powdered sugar, Limoncello, and lemon juice until smooth and pourable. Drizzle or spread glaze over cooled cookies.
09 - Garnish with additional lemon zest if desired. Allow glaze to set completely before serving.