Creating Ultimate Twice Baked Potatoes can be simple if you follow these clear steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C).

2. Bake the Potatoes: Wash the russet potatoes thoroughly, then pierce them with a fork several times. Place them directly on the oven rack and bake for about 45-60 minutes, or until tender.

3. Cool the Potatoes: Once baked, remove the potatoes from the oven and let them cool for about 10 minutes.

4. Prepare the Filling: Cut the potatoes in half lengthwise. Scoop out the insides into a mixing bowl, leaving a thin layer of potato in the skin.

5. Mix Ingredients: To the potato flesh, add sour cream, milk, butter, shredded cheddar cheese, Parmesan cheese, chopped green onions, salt, and pepper. Mix until creamy and well combined.

6. Refill the Skins: Spoon the mixture back into the potato skins, mounding it slightly.

7. Top with Cheese: Sprinkle additional shredded cheddar cheese on top of each filled potato.

8. Bake Again: Place the stuffed potatoes back in the oven and bake for another 15-20 minutes, or until the cheese is melted and golden.

9. Optional Toppings: If desired, sprinkle cooked bacon bits on top before serving.

10. Serve: Remove from the oven and let cool for a few minutes before serving.