Creating Chicken Cordon Bleu Casserole is simple and fun. Just follow these steps:

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 butter.
3. Mix Chicken and Ham: In a large bowl, combine the shredded chicken and diced ham.
4. Add Cheeses: Stir in the shredded Swiss cheese and half of the cheddar cheese to the chicken and ham mixture.
5. Make Sauce: In another bowl, whisk together the cream of chicken soup, milk, Dijon mustard, garlic powder, onion powder, black pepper, and salt until well combined.
6. Combine Mixtures: Pour the sauce over the chicken mixture and stir until everything is evenly coated.
7. Transfer to Baking Dish: Spread the mixture evenly in the prepared baking dish.
8. Add Topping: In a small bowl, combine the breadcrumbs with melted butter. Sprinkle the breadcrumb mixture evenly over the casserole.
9. Bake: Place the casserole in the preheated oven and bake for 30-35 minutes, or until bubbly and golden brown on top.
10. Cool and Serve: Once done, allow the casserole to cool for a few minutes before serving.

Enjoy the delightful flavors and comforting textures of your Chicken Cordon Bleu Casserole!