- Heat oil in a saucepan and splutter cumin seeds. 
- Add in the onions and cook till it becomes soft. 
- Add in the green chilies and ginger paste and saute for a couple of minutes. 
- Add in the coriander and turmeric powder and saute till the raw smell goes. 
- Add the chopped tomatoes and chilli powder and cook on low flame with closed lid till the oil floats on the top and the tomatoes are all smashed up. 
- Add a little water, around 1/2 cup, allow to boil. 
- Now add in the mushrooms, mix well and cook till the mushrooms are done. 
- Sprinkle garam masala and adjust the salt. Garnish with curry leaves and serve.