01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk flour, baking powder, baking soda, and salt in a medium bowl. Set aside.
03 - Beat butter and sugar with an electric mixer until light and fluffy, 2 to 3 minutes.
04 - Mix in egg until fully incorporated.
05 - Blend in ricotta, lemon zest, lemon juice, and vanilla until smooth.
06 - Gradually add dry ingredients on low speed until just combined. Avoid overmixing.
07 - Drop tablespoon-sized mounds onto prepared sheets, spacing 2 inches apart.
08 - Bake 13 to 15 minutes until set with lightly golden edges.
09 - Rest on sheets 5 minutes, then transfer to wire rack to cool completely.
10 - Whisk powdered sugar, lemon juice, and zest until smooth and pourable.
11 - Spoon or drizzle glaze over cooled cookies. Let glaze set before serving.