01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together flour, baking powder, baking soda, and salt in a medium bowl. Set aside.
03 - Beat softened butter and granulated sugar with electric mixer until light and fluffy, about 2-3 minutes.
04 - Add egg and beat until combined. Mix in ricotta cheese, lemon zest, lemon juice, and vanilla extract until smooth.
05 - Gradually add dry ingredients to wet mixture, mixing just until combined. Do not overmix.
06 - Drop rounded tablespoons of dough onto prepared baking sheets, spacing 2 inches apart.
07 - Bake for 13-15 minutes until edges are lightly golden. Centers should remain soft.
08 - Let cookies cool on baking sheets for 5 minutes, then transfer to wire rack to cool completely.
09 - Whisk powdered sugar and lemon juice until smooth and pourable. Add more juice if needed for desired consistency.
10 - Drizzle glaze over cooled cookies. Sprinkle with lemon zest before glaze sets if desired.