Chicken Cordon Bleu Casserole

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6 tablespoons salted butter

2 cups small-cubed ham

1 1/4 cups grated Swiss cheese

1 1/4 cups grated Monterey Jack cheese

4 cooked boneless, skinless chicken breasts, cut into cubes 

1/2 cup panko breadcrumbs 

1/4 cup all-purpose flour 

2 cups milk 

1 cup chicken broth 

2 tablespoons Dijon mustard 

1/2 teaspoon cayenne 

Kosher salt and freshly ground black pepper