Creating Chicken Cordon Bleu Casserole is simple when you follow these clear steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Prepare the Dish: Grease a 9×13-inch baking dish with olive oil to prepare for the casserole.
3. Combine Chicken and Ham: In a large mixing bowl, combine the shredded chicken and diced ham. Spread evenly in the prepared baking dish.
4. Layer the Cheese: Sprinkle half of the shredded Swiss cheese over the chicken and ham mixture.
5. Make the Sauce: In another bowl, mix together the sour cream, mayonnaise, Dijon mustard, garlic powder, onion powder, paprika, salt, and pepper until smooth.
6. Spread the Sauce: Pour the sauce evenly over the chicken, ham, and cheese layers.
7. Top with Remaining Cheese: Sprinkle the remaining Swiss cheese on top of the casserole.
8. Add Bread Crumbs: Evenly scatter bread crumbs over the top layer of cheese for a crispy finish.
9. Bake the Casserole: Place the casserole in the preheated oven and bake for 45 minutes or until bubbly and golden brown.
10. Garnish and Serve: Let the casserole sit for 10 minutes before serving. Garnish with chopped fresh parsley, if desired.

By following these straightforward steps, you’ll concoct a truly amazing Chicken Cordon Bleu Casserole that everyone will love!