Claire's Green Bean Casserole

4 cans green beans (Oregon Trail or other brand)
2 cans cream of mushroom soup
1 onion
1 can fried onion rings
1/4 cup bacos or chopped, fried bacon
Salt and pepper to taste

Heat beans in liquid about 5 minutes. Saute onion in a little butter. Add beans to onion, along with soup and a little bean liquid. Add bacon bits and seasoning. Place mixture in a casserole dish. Crumble onion rings on top. Bake at 350 degrees for approximately 20 minutes.