Fry the onions and garlic in oil. Add tomato paste and roughly diced peppers and fry briefly. Then add water and wine and stir in the stock powder. Bring to the boil and simmer until the vegetables are soft.
Add paprika powder, nutmeg, pepper, cream and sour cream and puree the sauce. Finally add the basil and season with the spices and only now with salt.
Salt the schnitzel, dust with flour (knock off excess flour) and fry briefly and hot on both sides in clarified butter or neutral oil. Pour the sauce into the pan, turn off the stove and let the schnitzel steep in the sauce for a short time.