Creating the Ultimate Green Bean Casserole is simple if you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Blanch Green Beans: In a large pot of boiling salted water, blanch the green beans for about 5 minutes until they are bright green and slightly tender. Drain and set aside.
3. Mix Ingredients: In a large mixing bowl, combine the cream of mushroom soup, sour cream, half of the cheddar cheese, garlic powder, onion powder, and salt and pepper. Stir until well blended.
4. Combine Beans and Mixture: Add the blanched green beans to the mixture, stirring until they are fully coated.
5. Transfer to Baking Dish: Pour the green bean mixture into a greased 9×13-inch baking dish, spreading it evenly.
6. Top with Cheese and Onions: Sprinkle the remaining cheddar cheese on top, followed by half of the French-fried onions.
7. Bake: Bake in the preheated oven for 30-35 minutes or until the casserole is bubbling and the top is golden brown. In the last 5 minutes of baking, sprinkle the remaining French-fried onions on top for extra crunch.

These steps will guide you in creating this incredible casserole effortlessly.