Preheat oven to 375 degrees Fahrenheit (190 degrees Celsius) and line a 9x5 inch loaf pan with parchment paper.
In a large mixing bowl, combine the ground chicken, panko breadcrumbs, milk, egg, salt, black pepper, garlic powder, onion powder, and Dijon mustard until just incorporated.
Spread approximately 50 percent of the chicken mixture into the base of the prepared loaf pan, pressing slightly to form a level surface.
Layer the deli ham and Swiss cheese slices over the chicken base, maintaining a half-inch margin from the edges of the pan.
Distribute the remaining chicken mixture over the ham and cheese layers, pressing the edges firmly to seal the filling inside the meatloaf.
In a small vessel, combine the grated Parmesan cheese and melted butter, then spread the mixture evenly across the top surface of the loaf.
Bake for 50 minutes, or until an instant-read thermometer inserted into the center of the loaf registers 165 degrees Fahrenheit (74 degrees Celsius).
Remove from oven and allow the meatloaf to rest for 10 minutes prior to slicing to ensure structural integrity and moisture retention.