How do you get the bottom of biscuits cooked on a Shepherds pie?

Its very easy and versitile! Basically we use a leftover gravy from a previous dinner of either shredded beef over noodles, or hamburget gravy with mashed potatoes. That is the bottom layer in a deep large baking dish, then add a layer of any veggie, frozen or canned (drained), then add a layer of your favorite cheese. Some people like onions added to their original gravy base as well, feel free to mix and match and make this recipe yours! Last is a deep layer of well seasoned real mashed potatoes. Buttery, with maybe added garlic salt, black pepper,