Grind together roughly chopped green chillies, onions, garlic, ginger, coriander leaves and salt. Add this mixture to the cleaned chicken pieces and marinade for about half an hour.
Heat oil in a wok or kadai. Add cumin seeds. When they begin to change colour add turmeric powder. Add the marinated chicken, small green chillies and mix well.
Add cumin powder, coriander powder and mix well. Add salt to taste and garam masala powder and mix again. Add half a cup of water and mix.
Cover and cook on medium heat for eight to ten minutes. Lower the heat and cook for another eight to ten minutes or till the chicken is cooked.