Heat the remaining 2 tbsp of ghee in a large pan
Add the peeled potatoes and toss and saute until the potatoes turn a light golden brown
Drain and set aside the potatoes
Add the sliced onions to the remaining ghee and on medium-low heat, fry until golden brown
Set aside some fried onions for garnishing later
Add the ground masala paste to the remaining onions. Mix well.
Now add the curd and mix again, keeping the heat low
When the mixture begins to bubble, add the spice powders - chilli, turmeric, coriander, cumin, and biryani masala
Mix and cook for 3-4 mins, adding salt as well
Add the fried potatoes and mix again well until they are coated with the masala
Now add the cooked rice to this and mix gently to combine
Pat down the biryani in the pan itself, turn off heat, and keep covered for 1-2 hours or until ready to serve
Before serving add more chopped coriander leaves and the reserved fried onions on top