Making Chicken Cordon Bleu Casserole is a straightforward process. Just follow these easy steps:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C).
2. Prepare the Casserole Dish: Grease a 9×13-inch casserole dish with cooking spray or butter to prevent sticking.
3. Mix the Chicken and Ham: In a large bowl, combine the cooked chicken and diced ham, mixing them until well incorporated.
4. Add the Cheese: Stir in 1 cup of shredded Swiss cheese into the mixture.
5. Prepare the Sauce: In a separate bowl, mix the cream of chicken soup, milk, Dijon mustard, garlic powder, onion powder, salt, and pepper until smooth.
6. Combine Ingredients: Pour the soup mixture over the chicken and ham, stirring well to combine everything evenly.
7. Transfer to Casserole Dish: Spread the mixture into the prepared casserole dish, ensuring it is evenly distributed.
8. Add Trail of Cheese: Sprinkle the remaining cup of shredded Swiss cheese on top of the chicken mixture, creating a gooey layer.
9. Top with Breadcrumbs: Evenly distribute the breadcrumbs over the cheese layer for a crunchy topping.
10. Bake: Place the casserole in the preheated oven and bake for 40-45 minutes, or until the cheese is bubbly and the breadcrumbs are golden brown.
11. Cool: Remove the casserole from the oven and let it cool for 10-15 minutes. This makes serving easier and allows the flavors to meld.

These steps will lead you to a stunning Chicken Cordon Bleu Casserole that is sure to impress!