Biryani in all the BIRs I've been to is merely re-cooked rice, I reckon.
Take 3/4 of a takeaway container of pilau rice.
Slice 1/2 an onion and fry it in oil till translucent.
Add in rice and stir fry, add precooked chicken.
Take a cup of frozen mixed veg and half an onion, stir fry in two tablespoons of oil until veg is cooked and onion is translucent and then add half a container of base stock. Cook as you would a curry.
Now get a frying pan and make an omelette out of two eggs.
Garnish with cucumber slices, tomato and chopped coriander, add the omelette and serve with the veg curry.