Creating your Chicken Cordon Bleu Casserole is a breeze when you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch casserole dish.
2. Mix Base Ingredients: In a large bowl, combine shredded chicken, diced ham, Swiss cheese, cream of chicken soup, sour cream, Dijon mustard, garlic powder, onion powder, salt, and pepper. Mix well until combined.
3. Pour into Dish: Transfer the chicken mixture into the prepared casserole dish, spreading it out evenly.
4. Top with Cheese: Sprinkle the shredded cheddar cheese over the chicken mixture for added flavor and creaminess.
5. Add Breadcrumbs: Evenly sprinkle the breadcrumbs on top of the cheese layer for a deliciously crunchy topping.
6. Bake: Place the casserole in the preheated oven and bake for 30-35 minutes, or until bubbly and golden brown on top.
7. Cool Slightly: Once cooked, remove the casserole from the oven and let it cool for about 5-10 minutes to allow it to set.
8. Garnish: If desired, sprinkle some freshly chopped parsley on top for a pop of color and freshness.

This step-by-step guide will ensure that your Chicken Cordon Bleu Casserole turns out perfectly every time!