Classic Green Bean Casserole Serves 6 4 cups canned green beans 1 can (10 oz) cream of mushroom soup 1/2 cup whole milk 1 1/3 cups French fried onions Directions: Place the mushroom soup, milk and pepper in a 1 1/2-quart casserole dish. Stir in beans and 2/3 cup of the fried onions. Reserve the rest for later.  Bake for about 20 to 25 minutes at 350F.  Then top with the remaining 2/3 cup fried onions and bake about 5 more minutes, until onions are lightly browned.