01 -
Whisk flour, baking powder, baking soda, and salt together.
02 -
Beat sugar, butter, and lemon zest until fluffy.
03 -
Mix in egg and yolk.
04 -
Add lemon juice and vanilla extract.
05 -
Mix in flour mixture until combined.
06 -
Chill dough for 45-60 minutes.
07 -
Heat oven to 350°F (175°C).
08 -
Roll 1 1/2 tablespoon-sized dough balls and place 12 on each baking sheet.
09 -
Bake for 9 minutes.
10 -
Cool cookies for 5 minutes on the pan before transferring to a wire rack.
11 -
Mix powdered sugar and lemon juice for the icing.
12 -
Spread or pipe icing onto cooled cookies and let set before storing.