Rinse the schnitzel under running water and pat dry. Heat the oil in a pan and fry the schnitzel briefly on both sides. Remove from the pan, season with salt and pepper. Spread a thin layer of tomato paste and mustard on both sides and place in a greased flat baking dish.
Peel, halve and slice the onions. Finely dice the bacon. Sweat both in the pan in the remaining fat and pour over the schnitzel.
Drain the puszta salad and mushrooms and mix with the cream. Spread the mixture over the schnitzel. Bake in the oven preheated to 160 ° C (fan oven) for about 45 minutes.