Pierogi with quark & potato

wheat flour 54.5% , water 16.7% , Quark Low Fat Soft Cheese 13.0% , potato flakes 6.0% , egg white 3.5% , sunflower oil 2.6% , butter 2.0% , onion 1.6% , onion 1.2% , iodised salt 1.0% , sugar 0.9% , garlic 0.8% , durum wheat semolina 0.7% , spice 0.6%