Take a bowl add chicken, yogurt,salt , biryani masala and chopped mint and coriander leaves. Mix it to coat all chicken pieces with the marinade
Soak rice in water and keep aside
Heat oil and add sliced onion and sauté it
Take marinated chicken and add garlic and green chillies
Cook them for 10 min.
Add rice into chicken and mix it
Add tomato , some coriander leaves and hot water. Bring mixture to boil and then simmer on low heat