Making your Loaded Chicken and Potato Casserole is simple if you follow these easy steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Cook the Potatoes: In a large pot, boil the diced potatoes in salted water for about 10-12 minutes or until tender. Drain and set aside.
3. Prepare the Sauce: In a mixing bowl, combine sour cream, chicken broth, cream of chicken soup, garlic powder, onion powder, salt, pepper, and parsley. Mix well until smooth.
4. Combine Ingredients: In a large mixing bowl, combine the cooked chicken, boiled potatoes, half of the cheddar cheese, and the sauce mixture. Stir until everything is well combined.
5. Transfer to Baking Dish: Pour the mixture into a greased 9×13-inch baking dish and spread it evenly.
6. Add Toppings: Sprinkle the remaining cheddar cheese on top, followed by Parmesan cheese. If using, add the crispy bacon bits for extra flavor.
7. Bake: Place the casserole in the preheated oven and bake for 30-40 minutes, or until the cheese is melted and bubbly and the top is slightly golden brown.
8. Cool: Once baked, remove the casserole from the oven and allow it to cool for about 10-15 minutes before serving. This helps the flavors to meld and makes it easier to dish out.
9. Garnish: Top with chopped green onions before serving for added freshness and color.

These straightforward steps will help you create a loaded chicken and potato casserole that is not only mouthwatering but also effortless to prepare.