01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, and salt. Set aside.
03 - In a large bowl, cream the butter and sugar until light and fluffy, about 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 combined.
05 - Gradually mix in the dry ingredients until a soft dough forms.
06 - Using a tablespoon or small cookie scoop, drop dough onto prepared baking sheets, spacing cookies 2 inches apart.
07 - Bake for 10–12 minutes, or until edges are lightly golden. Let cool on the baking sheet for 2 minutes, then transfer to a wire rack to cool completely.
08 - For the glaze, whisk powdered sugar, Limoncello, and lemon juice until smooth and pourable. Drizzle or spread glaze over cooled cookies. Garnish with extra lemon zest if desired. Allow glaze to set before serving.