These soft and buttery lemon curd cookies are filled with tangy homemade lemon curd, making them the perfect sweet and zesty treat for any lemon lover!
Make the Lemon Curd: In a bowl, combine sugar and lemon zest. Rub together with fingertips to release the oils.
Whisk in egg yolks and salt until pale and slightly fluffy.
Heat lemon juice in a saucepan until just boiling. Slowly pour into the egg mixture, whisking constantly.
Return mixture to saucepan. Cook over low heat, stirring constantly, until thickened (4–5 minutes). Do not boil. Remove from heat, stir in butter until smooth. Strain for a silky texture.
Chill: Transfer to a bowl, press plastic wrap directly onto the surface, and let cool to room temperature.
Make the Cookies: In a large bowl, combine sugar and lemon zest. Rub together with fingertips. Whisk in softened butter, eggs, lemon juice, and vanilla until smooth.
In a separate bowl, whisk flour, baking powder, and salt. Fold into wet mixture until you get a soft, smooth dough. Cover and chill for at least 1 hour (or overnight).
Assemble & Bake: Preheat oven to 350ºF (180ºC). Line two baking sheets with parchment paper.
Scoop about 2 tablespoons of dough per cookie. Roll into balls, coat in powdered sugar, and place on prepared sheets.
Use a ½-tablespoon measuring spoon to make a well in the center of each. Fill with 1 teaspoon lemon curd.
Bake for 9–12 minutes, until cookies are set, edges crack slightly, and curd puffs up.
Cool on the tray 5–10 minutes, then transfer to a wire rack.