Cream together the softened unsalted butter and granulated sugar until light and fluffy. Incorporate eggs, vanilla extract, and salt. Gradually add almond flour and all-purpose flour until a soft dough forms.

Wrap the dough in plastic wrap and refrigerate for at least 1 hour.

Preheat oven to 350°F. Roll out the dough to 1/4-inch thick. Cut out shapes, ensuring to cut half with a smaller center cut-out.

Bake the cookies in the preheated oven for 10-12 minutes or until golden. Cool on a wire rack.

Spread a layer of fruit jam on solid cookies and top with cut-out cookies. Dust with confectioners' sugar before serving.