Heat oil in a pan.Add whole garam to crackle.Add onion and fry till light brown.Add ginger garlic paste and mix well.Add chicken pieces and salt and fry for 7 - 8 mins on medium flame.When color of the chicken pieces are light brown add rice and mint leaves and green chilly and m,ix well.Add four cup of hot water and cover it and cook 15 mins on medium flame.Add a pinch garam masala and switch off the gas.Garnish with coriander leaves and serve.