1 (15 1/2 oz.) can green beans
1 (3 oz.) can mushrooms, sliced
1 can cream of mushroom soup
1 sm. can fried onions

Combine green beans, sliced mushrooms, soup, and 1/2 of can fried onions. Mix well and pour into greased baking dish. Top with remaining fried onions. Bake at 350 degrees for 30 minutes until heated through and golden around edges.