Heat oven to 375º
Line 2 baking sheets with parchment paper
In a medium bowl, combine the flour, baking powder and salt. Set aside.
In a large bowl, combine butter and sugar. Using an electric mixer, beat mixture until light and fluffy, about 3 minutes.
Add eggs, 1 at a time, beating until incorporated. Add the ricotta cheese, lemon juice nd lemon zest and beat to combine.
Stir in the dry ingredients. Spoon about 2 tbs dough for each cookie onto prepared baking sheets.
Bake 15 minutes, until slightly golden at the edges.
Remove from oven and let cookies rest on baking sheets for 20 more minutes
In a small bowl, combine powdered sugar, lemon juice and zest; stir until smooth
Spoon about 1/2 tsp. onto each cookie, and use back of the spoon to gently spread.
Let the glaze harden about 2 hours.