Creating Lemon Curd Thumbprint Cookies is simple when you follow these easy steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
2. Cream Butter and Sugar: In a large mixing bowl, beat the softened butter and granulated sugar together until light and fluffy.
3. Combine Dry Ingredients: In another bowl, whisk together the all-purpose flour, baking powder, and salt.
4. Add Egg Yolk and Vanilla: Add the egg yolk and vanilla extract to the butter-sugar mixture, mixing well to combine.
5. Mix in Dry Ingredients: Gradually blend the dry ingredients into the wet mixture until just combined.
6. Chill the Dough: Cover the dough in plastic wrap and chill in the refrigerator for 30 minutes.
7. Shape Cookies: Once chilled, remove the dough and scoop tablespoon-sized balls onto the prepared baking sheet, spaced a couple of inches apart.
8. Make Thumbprints: Use your thumb or the back of a measuring spoon to create an indention in the center of each cookie.
9. Fill with Lemon Curd: Spoon a small amount of lemon curd into each thumbprint.
10. Bake: Bake in the preheated oven for 12-15 minutes, or until the edges are lightly golden.
11. Cool: Let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack.
12. Dust with Powdered Sugar: If desired, lightly dust the cookies with powdered sugar before serving.