Spinach and mushrooms Wash spinach and cut in large pieces and mushrooms into thin slices. Peel onions and cut into thin. In a deep skillet melt the butter and put the mushrooms, onions and spinach stew for about 15 minutes on low heat. Sectioned chicken breasts in half, so as to obtain thin slices, which previously seasoned with salt and pepper. Fry lightly on both sides. Cut bacon into small cubes and added to the vegetables, then add the cream, add salt and aligned with pepper and left to simmer for 10 minutes, stirring occasionally. Spread the dough in a large sheet, which is smeared with mustard in the middle is distributed half vegetable mixture and sprinkle with grated cheese. Top rank chicken cutlets on them and pour the remaining vegetable mixture. Prihlupva dough to cover the filling and all I stick with a little water. Spread top with egg yolk, beaten with a little water. Bake in a preheated 180 C oven for about 1 hour. Once cool, cut into thick slices.