Bake at 350 degrees for about 25 … Prep time is about 5 minutes and cooking time is 5 minutes at 350 °F. Combine soup, milk, soy sauce, green beans, black pepper and about 1 cup of fried onions in a 1½-quart casserole dish. Ingredients include green beans, mushrooms, french fried onion rings and cream of mushroom soup. This easy southern green bean casserole recipe from Paula Deen is a traditional side dish perfect for Thanksgiving.