Preheat the oven to 375 degrees F. Mist a 9x13 inch dish with cooking spray.
Arrange thinned chicken breasts on the bottom of the dish and sprinkle with salt and pepper. Layer ham over each piece of chicken, followed by a slice of Swiss cheese.
Mix the panko and melted butter; sprinkle over the chicken.
Bake for 35-40 minutes or until chicken is cooked through.