Step 1

Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.

Step 2

In a large mixing bowl, cream together the butter and sugar until light and fluffy.

Step 3

Beat in the egg yolks and vanilla extract until well combined.

Step 4

Gradually mix in the flour and salt until the dough comes together.

Step 5

Roll the dough into 1-inch balls and place them on the prepared baking sheet.

Step 6

Using your thumb or the back of a spoon, make an indentation in the center of each cookie.

Step 7

Fill each indentation with blackberry preserves.

Step 8

Bake for 12-15 minutes, or until the edges are lightly golden.

Step 9

Allow the cookies to cool completely on a wire rack.

Step 10

Drizzle lemon curd over the cooled cookies.