Chop the onion, garlic, mushrooms and meat into small pieces. Heat olive oil, fry the meat in it for a few minutes, remove and keep warm. Add the onion, garlic and mushrooms to the oil and fry. Add the tomato pieces, bring to the boil briefly. Dust with flour and deglaze with the soup and bring to the boil. Season to taste with salt, pepper, oregano and parsley. Add the chopped bacon and the chicken and cook for 10 minutes.