Fry chicken with sliced onions and ceps (dried ceps should be soaked in cold water for 3-4 hours before cooking) until slightly golden. In a bowl, mix cream, sour cream, chopped dill, salt and pepper. Place fried chicken with onions and mushrooms in a deep baking tray, pour the cream mixture on top and set the tray in a pre-heated oven for 30-40 minutes.