In the same fry pan add butter, oil, add chopped onion, fry for a min, add mushrooms, flour, stock, seasonings and cream, cook for 2 mins, now add in the cooked chicken, mix and keep aside. Make batter for crepes by mixing altogether, add 1 tbsp oil and whisk well, grease 9 inch frying pan with oil, add prepared batter, spread evenly, cook on low flame from both the sides until golden, put prepared crepe on a working surface, add prepared chicken and sauce mixture, fresh coriander and fold it into a square, put stuffed crepe squares in a baking dish, add cheddar cheese, mozzarella cheese, crushed pepper, parsley, bake in a pre-heated oven for 10 mins until cheese melts, serve immediately.