In a large bowl, whisk together the flour, powdered sugar, and a pinch of salt. Add the cold butter, cut into cubes, and rub it into the flour mixture until it resembles coarse crumbs.
Add the egg yolks and vanilla extract, and knead until a smooth dough forms. Wrap in plastic wrap and chill in the refrigerator for 30 minutes.
Preheat your oven to 350°F (180°C) and line a baking sheet with parchment paper.
On a lightly floured surface, roll out the dough to about 3 mm (⅛ inch) thick. Cut out linzer shapes using cookie cutters. Use a smaller round cutter to cut out the centers of half of the cookies to create the tops with the holes.
Place the cookies on the prepared baking sheet and bake for 8-10 minutes, or until lightly golden. Let them cool completely on a wire rack.
Spread the flat side of the whole cookies with caramel cream filling, then top with the cookies that have the holes in the center.
Melt the dark chocolate and drizzle it over the tops of the linzer cookies for decoration. Let the chocolate set completely.
Dust the linzer cookies with powdered sugar before serving.
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