First of all, In a large bowl, combine flour, salt, and crushed peppercorns. Mix in the chicken pieces and combine.
In a nonstick skillet, heat some oil. Stir fry the chicken pieces until lightly browned. Drain on absorbent tissue.
Preheat the oven to 180°C. In the same saucepan, heat butter. Mix in the mushrooms and rosemary. Mix in white wine and cook for one minute.
Mix in onion. Mix in the sour cream. Mix in salt and crushed peppercorns. Cover and boil. Mix in the cheese.
Place fried chicken slices on a baking dish. Add the mushroom mixture to the top and continue the process. Sprinkle with parmesan cheese, salt, and crushed peppercorns.
Bake the dish for about 15-20 minutes in the oven.