Preparing Chicken Cordon Bleu Casserole is easy when you follow these simple steps:

1. Preheat Oven: Start by preheating your oven to 350°F (175°C).
2. Mix the Sauce: In a large bowl, combine the cream of chicken soup, milk, garlic powder, onion powder, black pepper, paprika, and Dijon mustard. Mix until well blended.
3. Combine Main Ingredients: In the same bowl, add the shredded chicken, diced ham, and shredded Swiss cheese. Stir until everything is well coated with the sauce.
4. Prepare the Baking Dish: Grease a 9×13-inch baking dish with cooking spray or butter.
5. Layer the Mixture: Pour the chicken, ham, and cheese mixture into the prepared baking dish. Spread it evenly.
6. Add Breadcrumbs: Sprinkle the breadcrumbs evenly over the top of the casserole, ensuring full coverage for a crispy topping.
7. Bake: Place the baking dish in the preheated oven and bake for 35-40 minutes, or until the casserole is bubbly and the breadcrumbs are golden brown.
8. Cool Slightly: Once cooked, remove the casserole from the oven and let it cool for about 5-10 minutes.
9. Garnish: Before serving, sprinkle some chopped fresh parsley on top for added freshness and color.
10. Serve: Portion out the casserole and enjoy this delightful dish!

These clear steps allow for effortless preparation of Chicken Cordon Bleu Casserole, ensuring you achieve a perfect result every time.