Preheat the oven to 375°F. Line a baking sheet with parchment paper or a silpat. Set aside.

In a medium bowl, whisk together flour, baking powder and salt. Set aside.

In a stand mixer, beat butter and sugar until light and fluffy. Add egg and lemon zest, mixing until combined. Add flour mixture 1/2 cup at a time, mixing until completely combined.

Roll one tablespoon of dough into small circles and then press with hands (or with the bottom of a cup) into a disk shape. Place on prepared baking sheet.

Bake for 8-10 minutes, until centers are set. The cookies will not look browned or cooked, but they are.

Remove from oven and use your thumb or the end of a wooden spoon to press in centers of cookies. Let cookies rest on baking sheet for 5 minutes. Then transfer to a wire rack to cool completely.

Spoon lemon curd into centers of each cookie. Dust with powdered sugar and serve.