Cut the chicken in square pieces. Blend green chillies, ginger, garlic, salt, black pepper,vinegar or lemon juice in blender.
Then mix it well with chicken and leave it for marination for 1 hour. Beat cream and yoghurt and mix it with marination chicken.
Put it in oven and bake it or grill it or pour 2tbs oil in pan and heat it high and cook that chicken till the yoghurt and water of chicken becomes dry.