Let’s dive into the step-by-step process of bringing this comforting dish to life. Remember, cooking is as much about enjoying the process as it is about the final product.

1. Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish with cooking spray.
2. In a large mixing bowl, combine the shredded chicken, diced ham, and 1 1/2 cups of Swiss cheese. Spread this mixture evenly in the prepared baking dish.
3. In a medium saucepan over medium heat, combine the heavy cream, chicken broth, Dijon mustard, garlic powder, salt, and pepper. Stir until the mixture is heated through and starts to simmer. Pour this sauce evenly over the chicken and ham mixture in the baking dish.
4. In a small bowl, mix the breadcrumbs with melted butter until they are well coated. Sprinkle the breadcrumb mixture evenly over the casserole.
5. Top with the remaining 1/2 cup of Swiss cheese.
6. Bake in the preheated oven for 25-30 minutes, or until the top is golden brown and the cheese is bubbly.
7. Remove from the oven and let it cool for a few minutes. Garnish with fresh parsley, if desired, before serving.

One tip from my own kitchen adventures: let the casserole rest for about 5 minutes before serving. This helps the flavors meld together beautifully, and it’s a great time to gather everyone around the table.