Beat the chicken fillet with a culinary hammer.
Grate the potatoes on a coarse grater and the cheese on a fine grater.
Finely dice the mushrooms and onions.
Cut the tomato into slices.
If necessary, grease the baking dish with vegetable oil. Place the beaten chicken fillet on the bottom of the dish, add salt and pepper to taste.
Place the mushrooms and onions on top.
Place the next layer of tomato slices and sprinkle with grated potatoes.
Spread the final layer of sour cream evenly and place in an oven preheated to 200 degrees for 35 minutes.
Remove the finished chicken from the oven, sprinkle with cheese and put it back in the oven for 5-7 minutes so that the cheese melts and bakes slightly. The dish is ready, you can serve it!