Preheat the oven to 180 °C. Peel the potatoes and boil them in salted boiling water until soft. Drain almost all the water, chop the potatoes into mashed potatoes, add the melted cheese, mix. Add the beaten eggs, mix until smooth, add salt.
Finely chop the peeled onion, fry in butter until golden brown. Lay out the minced meat, increase the heat to maximum and cook, stirring all the time and breaking the lumps until the minced meat changes color.
Put the minced meat in a baking dish with a diameter of 24 cm, put the potato-cheese mass on top, smooth it out, sprinkle with breadcrumbs. Bake at the bottom of the oven for 30 minutes. Serve hot.