Heat oven to 350℉/177℃.
Line 2 sheet pans with parchment paper. Set aside.
Combine flour, sugar, baking powder, baking soda, and lemon zest in a large bowl.
Whisk to combine. Set aside.
In a medium bowl, combine eggs, oil, lemon juice, and vanilla.
Whisk well.
Pour over dry ingredients.
Stir until combined.
Use a medium (1½ Tablespoon) cookie scoop to portion dough.
Roll dough into balls.
Roll each ball in powdered sugar.
Place 2-inches apart on prepared pans.
Bake for 12 minutes, until cooked but still slightly soft on top.
Remove from oven.
Immediately use the back of a rounded 1½ teaspoon measuring spoon to make a rounded indentation within the center of each cookie.
Fill each cookie with about 1½ teaspoons curd.