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

2. Add egg yolk, vanilla, and almond extract; beat until combined.

3. In a separate bowl, whisk together flour, ground almonds, and salt.

4. Gradually add dry ingredients to the wet mixture and mix until dough forms.

5. Divide dough in half, flatten into discs, wrap in plastic, and chill for at least 1 hour.

6. Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.

7. Roll dough to 1/8 inch thickness and cut out cookies using a round or fluted cutter.

8. Cut smaller shapes out of half of the cookies to create the tops.

9. Bake for 10–12 minutes or until edges are lightly golden.

10. Cool completely, then spread jam on the solid cookies and top with cutout cookies.

11. Dust tops with powdered sugar before assembling for a neat finish.