Creating this Loaded Chicken and Potato Casserole is a straightforward process. Follow these steps to achieve a delicious outcome:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Prepare the Potatoes: In a large pot, add the peeled and diced potatoes. Cover them with water, and bring to a boil. Cook until tender, about 10-15 minutes. Drain and set aside.
3. Mix the Chicken and Sauce: In a large bowl, combine the diced cooked chicken, sour cream, cream of chicken soup, milk, and Ranch dressing mix. Stir until well-combined.
4. Incorporate Garlic and Vegetables: Add garlic powder, salt, pepper, and optional broccoli florets to the mixture. Fold until everything is evenly incorporated.
5. Combine Potatoes: Gently fold the drained potatoes into the chicken mixture, ensuring they’re well coated.
6. Transfer to Baking Dish: Grease a 9×13-inch baking dish and pour the chicken and potato mixture in evenly.
7. Top with Cheese and Bacon: Sprinkle shredded cheddar cheese over the top, followed by the optional crumbled bacon.
8. Bake: Place the baking dish in the preheated oven and bake for approximately 45 minutes or until the casserole is bubbling and the cheese is golden brown.
9. Garnish: Once out of the oven, let it cool for a few minutes. Garnish with fresh parsley if desired.
10. Serve: Serve hot and enjoy the delightful flavors and textures of this loaded casserole!