Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish with cooking spray or butter.

In a large mixing bowl, combine the shredded rotisserie chicken and diced cooked ham. Stir in half of the Swiss cheese until evenly coated, then spread into the greased baking dish.

In a separate bowl, whisk together the heavy cream, chicken broth, Dijon mustard, garlic powder, onion powder, black pepper, and salt until smooth.

Pour the cream sauce over the chicken and ham mixture, ensuring all pieces are covered.

Mix the remaining Swiss cheese with the breadcrumbs and sprinkle over the casserole.

Bake for 30-35 minutes until the top is golden brown and bubbling.

Let the casserole rest for about 5 minutes before serving, garnish with fresh parsley if desired.