I absolutely love hamburger pie. (Never heard of it until my husband wanted it for supper one night and he had to tell me what it was). The way we do it has hamburger meat, creamed corn & mashed potatoes in it (I like to add green beans in mine as well but that's not how his mom done it so I just put them on the side).
Brown hamburger meat, make mashed potatoes (I prefer real but instant will work)
In a baking dish alternate putting in hamburger meat, mashed potatoes and creamed corn (however you would like to alternate them but you end with mashed potatoes on top).
There are tons of different recipes for hamburger pie on Cooks.com. Most contain ingredients like onions, tomato soup/paste, pie crust, biscuits, green beans, etc but we just use these 3 and it's perfect like that for us. Might try putting it in an pie crust next time just to see how it is.