I had never made this and saw a reciepe on the internet and realized how easy this is and how good it sounded. Totally comfort food and you probably already have everything to make it or something you can sub with,
Start with about 3-4 cups mashed potatoes--we like garlic taters or you could add shredded cheddar cheese. You will want enough to cover your casserole dish an inch or 2 thick (at least)
Dice an onion and 2 stalks of celery and cook in a little oil until done.
add 1# to 1 1/2# hamburger meat and brown. You can add some whole kernal corn and/or english peas or diced cooked carrots. Season to taste--salt, pepper, garlic powder.
To the hamburger mixture add one cup of gravy--jar, mix or leftover beef gravy. Add 2 T ketchup. Simmer until heated through.
Spray a casserole dish with Pam. Put the hamburger mixture in and top with the mashed taters. Bake at 375 from 30 minutes and let rest 10 minutes.
If you don't have any gravy you could use mushroom soup. Some people like diced tomatoes also.