Put the flour, icing sugar and 2 egg yolks into a mixing bowl. Add butter in flakes. Mix first with the dough hooks of the hand mixer, then with your hands to a smooth dough. Wrap in foil and chill for about 30 minutes. Shape the dough into walnut-sized balls and place on a baking tray lined with baking paper. Press hollows in the middle.
Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 15 minutes. Mix 1 egg yolk and cream. Spread the cookies while still hot and let them cool down. Warm up jellies separately and stir until smooth. Fill into the hollows of the cookies and let dry. Serve delicately dusted with icing sugar