Creating Chicken Cordon Bleu Casserole is straightforward with these clear steps:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C).
2. Prepare Dish: Lightly grease a 9×13-inch baking dish to prevent sticking.
3. Combine Chicken and Ham: In a large bowl, mix the cooked chicken and diced ham until evenly distributed.
4. Mix Cheese and Sauce: In another bowl, combine the shredded Swiss cheese, sour cream, chicken broth, Dijon mustard, garlic powder, onion powder, salt, and black pepper. Stir until thoroughly mixed.
5. Combine with Noodles: Fold the chicken and ham mixture into the cheese sauce, then gently mix in the cooked egg noodles until everything is coated.
6. Transfer to Baking Dish: Pour the mixture into the prepared baking dish, spreading it evenly.
7. Add Breadcrumb Topping: Sprinkle the breadcrumbs on top of the casserole for added crunch and texture.
8. Bake: Place the casserole in the preheated oven and bake for 30-35 minutes, or until the top is golden brown and the casserole is heated through.
9. Garnish: Once done, remove from the oven and let it cool for about 5 minutes. Garnish with fresh parsley, if desired.

By following these steps, you’ll have a delectable Chicken Cordon Bleu Casserole ready to serve!