Chicken Cordon Bleu Casserole

0 Preheat the oven to 350 degrees F.
1 Oil a 9x9 baking dish. Set aside.
2 In a large mixing bowl, mix the condensed cream of mushroom, milk, dry mustard, onion powder, garlic powder, salt, and ground pepper.  Mix to combine.
3 Add the diced ham and the cooked chicken. Mix to coat them with the condensed soup mixture.
4 Pour into the prepared baked dish. Spread evenly
5 Place the cheese slices on top.
6 Sprinkle the grated Parmigiano cheese.
7 Sprinkle the Panko crumbs and pour the melted butter.
8 Baked in the oven, uncovered for 35 to 40 minutes or until it is heated through and you have the desired golden crust on top.
9 Cool for 2 to 3 minutes.