Creating Million Dollar Potato Casserole can be straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Lightly grease a baking dish with cooking spray or butter.
2. Boil Potatoes: In a large pot, boil the cubed potatoes until tender, about 15-20 minutes. Drain well.
3. Mash Potatoes: In a large mixing bowl, mash the drained potatoes until smooth.
4. Add Ingredients: Mix in sour cream, cream of chicken soup, shredded cheddar cheese, grated Parmesan, crumbled bacon, garlic powder, onion powder, salt, and pepper. Stir until well combined.
5. Transfer to Dish: Pour the potato mixture into the prepared baking dish, spreading it evenly.
6. Prepare Topping: In a separate bowl, combine crushed cornflakes with melted butter. Mix until well-coated.
7. Top Casserole: Sprinkle the cornflake mixture evenly over the potato casserole.
8. Bake: Place the casserole in the preheated oven and bake for about 45-50 minutes, or until it’s hot and bubbly.
9. Let it Rest: Once out of the oven, allow the casserole to cool for about 10 minutes. This helps set the layers.
10. Garnish: Before serving, sprinkle sliced green onions on top for a fresh garnish.

These steps will guide you in creating this incredible casserole effortlessly. Every layer will be packed with flavor and sure to please!