Making the Delicious Chicken Cordon Bleu Casserole is easy if you follow these steps:

1. Preheat Oven: Start by preheating your oven to 350°F (175°C).
2. Prepare Casserole Dish: Grease a 9×13-inch casserole dish with cooking spray or butter.
3. Combine Chicken and Ham: In a large bowl, mix the shredded chicken and diced ham until well combined.
4. Prepare Cheese Mixture: In another bowl, combine the sour cream, mayonnaise, Dijon mustard, garlic powder, onion powder, salt, and black pepper. Stir until smooth.
5. Layer Ingredients: Spread half of the chicken and ham mixture evenly in the bottom of the prepared casserole dish.
6. Add Cheese: Sprinkle half of the shredded Swiss cheese over the chicken and ham layer.
7. Spread Sauce: Pour half of the sour cream mixture over the cheese layer, spreading evenly.
8. Repeat Layers: Repeat the layering process with the remaining chicken and ham, cheese, and sour cream mixture.
9. Top with Breadcrumbs: Finally, sprinkle the breadcrumbs evenly over the top layer of the casserole.
10. Bake: Place the casserole in the preheated oven and bake for 30-35 minutes, or until bubbly and golden brown on top.
11. Cool and Garnish: Once baked, allow the casserole to cool for about 5-10 minutes. Sprinkle with fresh parsley if desired before serving.

These simple steps will guide you to create an incredible casserole that’s both delicious and satisfying.