1. Preheat your oven to 350°F (175°C).
2. In a large bowl, cream together the softened butter and sugar until light and fluffy.
3. Add the eggs and vanilla extract, mixing until well combined.
4. In a separate bowl, whisk together the flour, baking powder, and salt.
5. Gradually add the dry ingredients to the wet mixture, stirring until a dough forms.
6. Roll the dough into small balls and place them on a baking sheet lined with parchment paper.
7. Use your thumb to make an indentation in the center of each cookie.
8. Fill each indentation with lemon curd.
9. Bake for 12-15 minutes or until the edges are lightly golden.
10. Allow to cool before serving.

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