Mix the ginger and garlic in the chicken and set aside.
In a non stick pan, put the chicken with the ginger and garlic on low heat till all the water from the chicken has evaporated and the chicken has turnes soft.
Add the pepper and chilli powder with 3 tbsp oil and let the chicken fry a little with this masalas till the sides of the chicken turns light brown.
Add the tomatos and the green chillies and let the chicken cook in this till the tomato gravy thickens.