Boil potatoes until soft, about 30 minutes over medium heat. Then let them cool completely and squeeze through a potato press, if you do not have one, you can also use a meat grinder. Add the farmers cheeses and egg to the smooth potato mixture. Start adding the potato flour mix quickly to form the dough until desired consistency. Cut the ready dough into smaller pieces, with each hand roll to the thickness of the finger, coat in flour, with a sharp knife cut into diamond shapes at an angle. Pour about 5 L of water to a pot, add salt to the water. Place the dumplings in the boiling water. Cook 1/3 serving at a time, as soon as the dumplings rise to the top, give 1-2 minutes and take it out of the pot. Brown bread crumbs in butter and pour over the top of the dumplings. Serve warm. Enjoy!