Cut mushrooms in slices.
Heat oil and fry onions until golden brown in colour.
Add garlic paste and cut tomatoes.
Put chilli powder, turmeric, garam masala and salt.
Saute for 3-4 minutes or until it starts leaving oil.
Add mushrooms and mix well.
Simmer and stir fry till mushrooms are tender.
Add very little water, if necessary.Serve decorated with coriander.