Peel and chop the onion. Wash the tomatoes.
Beat the chicken fillet, place in a baking dish, salt and add your favorite spices.
Place onions on top. Then add salt to the tomatoes, cut into slices. Lubricate everything with mayonnaise or sour cream. Sprinkle with grated cheese.
Bake the dish in the oven for 40 minutes at 200 °C.
Sprinkle the chicken with herbs. The dish can be served on its own or you can add a side dish in the form of mashed potatoes.