Hamburger Casserole

1 lb. hamburger
chopped onion
salt/pepper
1 can condensed tomato soup
1 can drained fresh green beans
mashed potatoes
fried onion rings

Brown ground meat & season w/onions, salt & pepper.  Add soup & green beans (I use frozen mixed vegetables) & mix well. Place in casserole & cover w/mashed potatoes & sprinkle w/onion rings on top. Bake at 350 for 1/2 hour.