01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
03 - In a large bowl, beat butter and sugar together until light and fluffy, about 2–3 minutes.
04 - Add the egg, ricotta cheese, lemon juice, lemon zest, and vanilla extract. Mix until well combined.
05 - Gradually add the dry ingredients to the wet mixture, mixing on low speed until just incorporated.
06 - Drop rounded tablespoons of dough onto prepared baking sheets, spacing about 2 inches apart.
07 - Bake for 13–15 minutes, or until the edges are just starting to turn golden. The centers should remain soft.
08 - Allow cookies to cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.
09 - Prepare the glaze by whisking together powdered sugar, lemon juice, and lemon zest until smooth and pourable.
10 - Once cookies are completely cool, spoon or drizzle glaze over each cookie. Let set for 15 minutes before serving.