heat oil in a pan then add thinly sliced onion.saute well till onion become soft.then add ginger garlic paste and green chilly.saute well till raw smell goes .then add chilly powder,coriander powder and garam masala. saute well,you will get a nice masala smell that time add chicken pieces, mix well,check salt consistency add if needed.saute well and cook for few more minutes.then switch off the stove.