For the sauce, peel the onion, chop it finely and sauté it in a little oil. Peel the garlic, press and add, roast the tomato paste. Then deglaze with the tomatoes, season with salt, pepper and herbs (sprinkle the basil on top after baking, it will retain more aroma) and simmer a little.
In the meantime, wash the schnitzel and season with salt and pepper on both sides.
Put some tomato sauce in a flat baking dish, place the schnitzel in it and cover with the remaining sauce. Then cut the mozzarella into slices and place on top of the schnitzel.
Put the whole thing in the preheated oven at 200 ° C for about 30 minutes.