Green Beans Almondine

1 (10 oz.) pkg. frozen green beans
1 (10 1/2 oz.) can cream of mushroom soup
1/2 c. milk
1 (4 to 6 oz.) pkg. slivered almonds
1 (7 oz.) can ready-to-serve French fried onion rings
1/2 cube butter, sliced

Arrange frozen green beans in baking dish. Mix mushroom soup and milk together. Pour 1/2 of soup mixture over green beans. Arrange French onion rings over casserole. Drizzle remaining soup mixture over the casserole. Sprinkle with slivered almonds and drop slices of butter over the entire casserole. Bake 35 to 45 minutes in 350 degree oven.