Preheat the oven: Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
Mix dry ingredients: In a medium bowl, whisk together the flour, baking powder, and salt.
Cream butter and sugar: In a large bowl, beat the softened butter and granulated sugar with an electric mixer until light and fluffy, about 3 minutes.
Add wet ingredients: Beat in the eggs, lemon juice, lemon zest, and vanilla extract until well combined.
Combine mixtures: Gradually add the dry ingredients to the wet mixture, mixing until a dough forms.
Shape cookies: Drop tablespoonfuls of dough onto the prepared baking sheet, spacing them about 2 inches apart. Using your thumb or the back of a spoon, make a small indentation in the center of each cookie.
Bake: Bake for 10-12 minutes, or until the edges are golden brown.
Add lemon curd: Once the cookies are cool, spoon a small amount of lemon curd onto each cookie.
Serve: Garnish with additional lemon zest if desired and enjoy!