Ruthanna Roberts made a version of this for a fellowship meal. I loved it and thought it would make a good teen dish/large crowd dish.
This is my version. But the bottom line is that you make a flat meatloaf and top with cheese and mashed potatoes. You could also add veggies (mushrooms, mixed veggies)
Make a meatloaf. This is my favorite recipe. It is from The Basics and More cookbook.
Preheat oven to 350. Mix all ingredients together.
1.5 to 2 pounds of hamburger
1 cup bread crumbs
3/4 cup milk
1/4 cup onion or 2 to 3 Tablespoons minced onions
1 tsp Montreal steak seasoning
Flatten into a 9 x 13 pan. Bake 30-45 minutes
Remove from oven. Drain extra grease. Meanwhile make mashed potatoes (about 5 to 7 servings of instant)
6 slices of american cheese
4 ounces velveeta cheese cut into small pieces
(If you are adding veggies place them on top of meatloaf after the american cheese and before the potatoes)
Place the 6 slices of american cheese. Top with mashed potatoes. Then add velveeta cheese to the top. Push the cheese down into the potatoes. Bake another 15 to 20 minutes.