Chicken Cordon Bleu Casserole

Name: Chicken Cordon Bleu Casserole
Prep time: 5 min
Cook time: 40 min
Total time: 45 min
Cuisine: American
Ingredients: 5 1/2 cups shredded rotisserie chicken; 2 cups cubed ham; 4 tablespoons unsalted butter; 1/4 cup all-purposed flour; 2 cups milk; 1 tablespoon Dijon mustard; 1 tablespoon lemon juice; 1/2 teaspoon garlic powder; 1/4 teaspoon salt ((add more to taste)); 1 1/4 cups shredded Swiss cheese ((5 ounces)); 1/4 cup grated Parmesan cheese; 1 cup Panko bread crumbs; 2 tablespoons butter (melted)