01 - Preheat your oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
03 - In a large bowl, cream the butter and sugar together with an electric mixer until light and fluffy, about 2-3 minutes.
04 - Beat in the egg, then add the ricotta cheese, lemon juice, lemon zest, and vanilla extract. Mix until smooth.
05 - Gradually add the dry ingredients to the wet mixture, mixing until just combined. Do not overmix.
06 - Drop rounded tablespoons of dough onto the prepared baking sheets, spacing them about 2 inches apart.
07 - Bake for 13-15 minutes, or until the edges are just golden and the centers are set.
08 - Allow cookies to cool on the baking sheets for 5 minutes, then transfer to a wire rack to cool completely.
09 - For the glaze, whisk together the powdered sugar and lemon juice until smooth and pourable.
10 - Spoon or drizzle the glaze over the cooled cookies. Sprinkle with additional lemon zest, if desired. Allow the glaze to set before serving.