Creating the Twice Baked Potato Casserole is straightforward. Follow these steps to make this incredible dish:

1. Preheat the Oven: Preheat your oven to 400°F (200°C).
2. Bake the Potatoes: Wash the russet potatoes, prick them with a fork, and bake in the oven for about 45-60 minutes or until fork-tender. Let them cool slightly.
3. Prepare Filling: Cut each potato in half lengthwise and scoop out the insides into a large mixing bowl.
4. Mix Ingredients: To the potato flesh, add sour cream, shredded cheddar cheese, cream cheese, cooked bacon, milk, butter, garlic powder, onion powder, salt, and pepper. Mash until creamy and well combined.
5. Transfer to Casserole Dish: Spoon the potato mixture into a greased 9×13-inch casserole dish, spreading it evenly.
6. Top with Cheese: Sprinkle additional cheddar cheese on top to create a melt-in-your-mouth topping.
7. Bake: Place the casserole dish in the oven and bake for 30-35 minutes or until the cheese is melted and golden brown.
8. Garnish: Remove from the oven, and sprinkle chopped green onions on top if desired.
9. Cool Slightly: Allow the dish to cool for about 5-10 minutes before serving so it sets up nicely.

These steps will help you create a creamy, tasty Twice Baked Potato Casserole with minimal hassle.