Creating Classic Southern Green Bean Casserole is easy when you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Blanch Green Beans: In a large pot of salted water, bring water to a boil. Add the green beans and blanch for about 5 minutes. Drain and set aside.
3. Mix Base Ingredients: In a large mixing bowl, combine the cream of mushroom soup, milk, garlic powder, onion powder, salt, and pepper. Mix well.
4. Combine Green Beans: Add the blanched green beans to the mixture and stir until the beans are evenly coated.
5. Transfer to Casserole Dish: Pour the mixture into a greased 9×13-inch casserole dish, spreading it evenly.
6. Add Cheese: If using, sprinkle shredded cheddar cheese on top of the green bean mixture.
7. Top with Fried Onions: Evenly distribute the French fried onions over the top of the casserole for a crunchy texture.
8. Bake: Place the casserole in the preheated oven and bake for 25-30 minutes, or until bubbly and golden brown on top.
9. Serve: Remove from the oven and let it cool for a few minutes before serving.

These easy steps will help you create an incredible Classic Southern Green Bean Casserole that delights and satisfies.