Creating the Chicken and Potato Casserole is simple when you follow these easy steps:

1. Preheat Oven: Set your oven to 350°F (175°C) to prepare for baking.
2. Prepare the Dish: Grease a large baking dish with olive oil or cooking spray to prevent sticking.
3. Layer Potatoes: Arrange half of the sliced potatoes evenly at the bottom of the prepared baking dish.
4. Add Chicken: Spread the cooked chicken over the layer of potatoes.
5. Season: Sprinkle garlic powder, onion powder, salt, and pepper over the chicken.
6. Pour Soup and Milk: In a bowl, combine the cream of chicken soup and milk. Stir well, then pour over the chicken and potatoes evenly.
7. Add Remaining Potatoes: Layer the remaining sliced potatoes on top of the soup mixture.
8. Cheese Layer: Sprinkle shredded cheddar cheese generously over the top of the casserole.
9. Cover: Tent the dish with aluminum foil to avoid excessive browning.
10. Bake: Place the casserole in the preheated oven and bake for 30 minutes.
11. Uncover: After 30 minutes, remove the foil and bake for an additional 15-20 minutes, or until the top is golden brown and bubbly.
12. Cool: Once done, take out the casserole and let it cool for about 10 minutes before serving.
13. Garnish: Optionally, sprinkle fresh parsley on top for a pop of color and additional flavor.

Following these steps will guide you in creating a mouthwatering Chicken and Potato Casserole that everyone will love!