Wash and cut the mushrooms in desired shape. Also chop onions, green chillis and tomatoes into small pieces.
Heat oil, add onions and green chillis and fry for few minutes. Now add ginger-garlic paste and toss for a while. Now when the raw smell is away add tomatoes, turmeric powder, chilli powder, coriander powder, garam masala, salt and cook till they become a creamy paste. Add water if necessary.
Once its done add the mushrooms and cook for 5-10 minutes till its done.
Garnish with coriander leaves and chopped spring onions.