Broccoli Casserole

Mom's Broccoli Casserole

1 small onion, chopped
2 cups minute rice
16 oz chopped broccoli (frozen)
1 can cream of mushroom soup
1/2 tsp salt
3 tbsp. butter
1/4 cup water
1/4 cup milk
1 8 oz jar cheese whiz

Cook rice and broccoli according to pkg directions.  Mix all ingredients together in casserole dish and bake at 350 for 35-40 minutes.