Peel and finely dice the onion, sweat in hot butter in a large saucepan. Pour in the meat stock and cream, heat. Grate the potatoes. Cut the cheese into small pieces and add to the soup.
Heat slowly while stirring, gradually adding the wine. Thicken the soup with the grated potatoes. Season with caraway seeds, pepper, salt and parsley.
Toast and dice the bread. Sprinkle the cheese soup with the croutons and serve.