Creating Loaded Green Bean Casserole is straightforward if you follow these steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Prepare Green Beans: In a large pot of boiling water, blanch the green beans for 3-4 minutes until tender-crisp. Drain and set aside.
3. Sauté Vegetables: In a skillet, heat olive oil over medium heat. Add chopped onion, sliced mushrooms, and minced garlic. Sauté for 5-7 minutes until soft and fragrant.
4. Combine Ingredients: In a large mixing bowl, combine the blanched green beans, sautéed vegetables, sour cream, cream of mushroom soup, shredded cheddar cheese, salt, black pepper, paprika, and cayenne pepper (if using). Stir until well mixed.
5. Transfer to Baking Dish: Pour the mixture into a greased 9×13-inch baking dish, spreading it evenly.
6. Add Topping: Sprinkle the crispy fried onions over the top of the casserole.
7. Bake: Place the casserole in the preheated oven and bake for 30-35 minutes, or until bubbly and golden brown.
8. Cool Slightly: Once baked, allow the casserole to cool for a few minutes before serving.

By following these steps, you will create a delicious Loaded Green Bean Casserole that will impress your family and friends!