Creating the Creamy Green Bean Casserole from Scratch is straightforward and will fill your home with delightful aromas. Follow these steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).

2. Blanch the Green Beans: In a large pot of boiling salted water, add the green beans. Cook for about 5 minutes, then drain and transfer them to an ice bath to stop cooking. Set aside.

3. Sauté the Aromatics: In a large skillet, melt the butter over medium heat. Add the chopped onion and sauté until translucent, about 5 minutes. Add garlic and sauté for an additional minute.

4. Make the Cream Sauce: Sprinkle the flour over the onions and garlic, stirring constantly for about 1 minute. Gradually whisk in the milk and chicken broth. Increase the heat and bring to a simmer, stirring until thickened, about 3-5 minutes.

5. Season the Sauce: Stir in Dijon mustard, Worcestershire sauce, salt, and pepper. Remove from heat and fold in the blanched green beans.

6. Transfer to a Baking Dish: Pour the green bean mixture into a greased 9×13-inch baking dish.

7. Top with Fried Onions: Sprinkle half of the crispy fried onions over the green bean mixture. If you prefer, add grated cheddar cheese for an extra layer of flavor.

8. Bake the Casserole: Bake in the preheated oven for 20 minutes, or until bubbly and golden on top.

9. Add More Topping: Remove from the oven, stir the casserole, and sprinkle the remaining fried onions on top.

10. Broil if Desired: For an extra crispy topping, broil on high for 2-3 minutes, keeping a close eye to avoid burning.

11. Serve: Allow the casserole to cool slightly before serving.

With these clear instructions, you can effortlessly create this delicious Creamy Green Bean Casserole from Scratch that everyone will love!