Marinate chicken in ginger garlic paste, salt, black pepper and yogurt for half an hour.
Wash, peel and slice the potatoes into thin strips, like french fries. Heat oil in a frying pan or wok and fry them till crisp. Set aside.
Heat oil in a pot, and add the chicken with all the marinade. Saute on high heat for a few minutes till the chicken changes color from pink to white. Turn heat to low, and then cook till chicken is tender (about 35 - 45 minutes). Make sure to stir every few minutes so that the chicken doesn't stick to the bottom.
Once the chicken is almost cooked through, add the peas and cook for a few minutes till tender. Stir through.
Pour the chicken in a serving dish, and top with the french fries. Give it a toss and serve hot.
If the chicken is served immediately, the french fries will remain crisp, otherwise they will turn soft and soak up the yoghurt based gravy. The dish tastes delicious either way, so serving depends on personal preference.