• 5 cups shredded chicken.
• 9 ounces sliced deli-style black forest ham, cut into strips (about 9 slices).
• 8 ounces sliced Swiss cheese (about 12 thin slices).
• 6 Tablespoons unsalted butter.
• 1 Tablespoon Dijon mustard.
• 1 Tablespoon freshly squeezed lemon juice (optional).
• 1 teaspoon garlic powder.
• ¼ teaspoon nutmeg (optional).
• ¼ teaspoon cayenne pepper (optional).
• 6 Tablespoons all-purpose flour.
• 1 ½ cups Panko breadcrumbs.
• 4 Tablespoons unsalted butter, softened to room temperature.
• Chopped parsley (optional).