We made chicken biryani last night using Bombay Biryani Masala of Shan. It is my favorite for making biryani.
I pretty much follow the recipe on the pack. And while making layers at the end of rice and the chicken masala, I add a couple more layers of yogurt mixed with some cinnamon powder and garam masala and another layer on top of that of fried onions.
What this does is that, you get moist clumps of fried onions in your every bite. Delicious!