Here is a special Thanksgiving cooking game for you in which you will learn how to cook green bean casserole. First boil the green beans in salted boiling water. Next, prepare onion and beacon mixture; and then prepare the sauce using the essential ingredients. Add green beans in the sauce and stir it gently to combine. Add green bean mixture in the baking dish and sprinkle fried onion over the top. Place the baking dish in the oven and bake it. After baking remove the green beans casserole from the oven and serve.