Cut butter in ½-inch cubes.

In a large bowl blend flour with baking powder.

Add sugar, vanilla sugar, butter, and the egg.

Knead to a smooth dough.

Shape dough into a square, cover with plastic wrap and refrigerate for 30 min.

Preheat oven to 325F and line baking sheets with parchment paper or a silicone mat.

On a lightly floured surface, roll the dough out to ¼-inch in thickness.

Cut cookies in sets of three – small, medium and large.

Place them on the baking sheets.

Bake for about 10 min or until edges are light golden.

Allow cookies to cool on the baking sheets for a couple of minutes, then transfer to wire racks to cool completely.

Place a small amount of jam on the largest cookie, top with a medium cookie, add a small amount of jam on the medium cookie and top with a small cookie.

Dust with powdered sugar.