Wash the champignons thoroughly and dry. Peel the onion and rinse under cold running water. Grate the cheese using a grater with medium-sized holes.
Cut the onion into small cubes, the champignons into thin slices. Sauté the onion until translucent in a well-heated frying pan with a small amount of vegetable oil. Place the mushrooms in a frying pan with the onions and fry them over high heat to evaporate the liquid as quickly as possible. At the end of frying, add spices.
Line a baking dish with foil. Grease the foil with oil and place the dumplings in one layer. There is no need to defrost them, they should be firm. Place fried champignons and onions on top.
Serve our original dumplings hot, transfer from the pan to a plate, being sure to remove the foil. You can decorate the perimeter of the dish with fresh seasonal vegetables and herbs. You can divide it into pieces directly in the form and serve it in portions, decorating each portion separately.