Heat oil in a kadhai. When hot, add cumin seeds and let them crackle.
Add chopped onions and on medium flame fry till they change color.
Now, add ginger garlic paste. Add turmeric powder and salt, fry for few seconds.
Add washed chicken pieces. On high flame fry for 5minutes.
Now, cover the kadhai and cook on low flame for 15-20minutes. Keep checking and stirring in between to avoid burning of the masala at the bottom. Dry excess water, cook on high flame till water evaporates.
Add red chilly powder, coriander powder, salt if needed, and garam masala. Fry well.
Next, add the slit green chilies and few curry leaves. Give a mix and keep frying for another minute to coat the chicken well. Lastly, add coriander leaves.
Serve hot with a squeeze of lemon juice.