Creating this Chicken Cordon Bleu Casserole is straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish.
2. Combine Ingredients: In a large bowl, mix the shredded chicken, diced ham, and shredded Swiss cheese.
3. Prepare Sauce: In another bowl, whisk together flour, chicken broth, heavy cream, Dijon mustard, garlic powder, onion powder, black pepper, and salt until smooth.
4. Mix: Pour the sauce over the chicken mixture and stir until everything is well coated.
5. Transfer to Dish: Spread the mixture evenly in the greased baking dish.
6. Prepare Topping: In a separate bowl, combine the breadcrumbs with the melted butter until coated.
7. Top Casserole: Sprinkle the breadcrumb mixture evenly over the top of the casserole.
8. Bake: Place the casserole in the preheated oven and bake for 30-35 minutes or until bubbly and golden brown on top.
9. Cool: Once baked, remove the casserole from the oven and let it cool for about 10 minutes.
10. Garnish: Before serving, sprinkle fresh parsley on top for a burst of color.

These steps will guide you in creating an incredible Chicken Cordon Bleu Casserole without hassle.