Firstly, wash and cut the mushrooms into 2 pieces.
Boil Mushrooms for 7-8 mints and drain them and keep aside.
Add, butter in a pan and add garlic and green chillies.
Fry them a little and then add black pepper and salt.Add the freshly boiled mushrooms and oregano.
Stir fry for a 4-5mints.Sprinkle it with Chilly Flakes.Serve Hot.