I got the Hamburger Pie recipe from Dr. Collins' website at diethobby.com. I added onion and mushrooms in with the hamburger when frying. I also added a homemade pizza sauce at serving. It was similar to a mini meatloaf and I'd definitely make again because it was very easy and tasty. I froze the remainder for later meals.
The pizza sauce was made from tomato paste, tomato sauce, garlic salt/powder, and basil.