Heat oil in a heavy bottom pan and fry spice mix along with onions, ginger garlic paste and little salt. When onion changes color, add chicken pieces.
Add biryani masala, green chilies, handful of coriander leaves, red chilli powder, lime juice, yogurt and cover with lid.
Cook on medium-high heat until chicken is fully cooked. This will take 15-20 minutes.
In the mean time, in a separate vessel, add 2-3 cups of water and after water boils, add little salt, jeera and soaked rice. Cook until rice is 90% cooked. This will take roughly around 10 minutes. Remove and strain the rice.
Now to make layers,First add half of the rice at the bottom of the baking pan
Sprinkle ghee, chopped coriander, saffron milk and then arrange all 8 cooked chicken pieces (don't add the gravy you get after chicken is cooked. Reserve it for the end part on top of this rice.)
Again add remaining rice on top of chicken and sprinkle ghee, chopped coriander, saffron milk and the gravy of the chicken which you had reserved.
Cover this pan tight with aluminium foil and bake at preheated oven at 350 degree Fahrenheit for about 20 minutes.
Heat a little oil on a skillet and fry sliced onions and caramelize until they turn brownish black in color.Garnish biryani with this(optional)
Remove and serve hot
NOTES : Now thats an authentic Malabari Style Biryani.