1 lb. hamburger
1/2 sm. onion chopped (optional)
1 can green beans, drained
1 can tomato soup
2 c. mashed potatoes (fresh or instant)
1/2 c. grated cheese (Cheddar with Swiss, Monterey Jack, whatever you have)

Brown hamburger and onion, drain. Add green beans, soup and salt and pepper to taste. Pour in 2 quart casserole. Spread mashed potatoes on top and sprinkle with cheese. Bake at 350 degrees for 30 minutes.