Creating Chicken Cordon Bleu Casserole is simple, and the steps below will guide you through the process:

1. Preheat Oven: Preheat your oven to 350°F (175°C).

2. Prepare Baking Dish: Grease a 9×13 inch baking dish with cooking spray or a bit of oil.

3. Mix Chicken and Ham: In a large mixing bowl, combine the shredded chicken and diced ham.

4. Add Cheese: Stir in one cup of Swiss cheese, reserving one cup for topping later.

5. Prepare Sauce: In a separate bowl, whisk together the cream of chicken soup, milk, Dijon mustard, garlic powder, onion powder, salt, and pepper until well combined.

6. Combine Mixtures: Pour the soup mixture over the chicken and ham, stirring until everything is evenly coated.

7. Transfer to Baking Dish: Pour the combined mixture into the prepared baking dish, spreading it evenly.

8. Top with Breadcrumbs: Sprinkle the breadcrumbs evenly over the casserole.

9. Add Remaining Cheese: Top with the remaining cup of Swiss cheese for a deliciously gooey finish.

10. Bake: Place the dish in the preheated oven and bake for about 35-40 minutes, or until the top is golden brown and the casserole is bubbling.

11. Garnish and Cool: Once baked, remove from the oven and let it cool for a few minutes. If desired, sprinkle fresh parsley on top for a touch of color.

Following these steps will lead you to a delightful Chicken Cordon Bleu Casserole that smell divine and looks just as appealing!