Green bean-mushroom casserole

6 servings

2 packages (10 ounces each) frozen cut green beans
¼ cup finely chopped onion
¼ cup water
1 teaspoon salt
1 can (10½ ounces) condensed cream of mushroom soup
1 can (4 ounces) mushroom stems and pieces, drained, chopped
½ cup canned french-fried onion rings

Cook beans and chopped onion in water with salt until beans are tender, 12 to 15 minutes. Drain.

Stir in undiluted soup and mushrooms. Pour into greased 1½-quart casserole. Top with onion rings. Cover and bake at 350° F. (moderate oven) 30 minutes, or until mixture is heated through and top is brown.