I like to use leftovers roasted chicken from the day before or you can use cubed uncooked chicken. You can also add leftovers roasted vegetables to the fillings. Zucchini, mushrooms and spinach can also be added.
I like to bake the pot pie in a large ceramic oven proof pie dish, but individual small pie dishes make a nice presentation.
While you can certainly make your own puff pastry I’m a big proponent of the frozen kind. I always keep a couple of boxes ready to go. My favorite kind is http://www.dufourpastrykitchens.com/retail_puff.php