Chop onions and garlic and sauté in olive oil. Add the tomatoes and cream. Chop the Gorgonzola and fold in. Dissolve the stock cubes in a little water (or use granular stock) and add to the sauce with sage. Salt and pepper.
Salt and pepper the schnitzel and turn in the flour.
Grease the baking dish, fill in half of the sauce, place the schnitzel on top and cover with the rest of the sauce.