1Layer the shredded rotisserie chicken in a casserole dish, followed by the chopped ham, and top with slices of Swiss cheese.
2In a separate pot, melt the butter, whisk in the flour, and slowly add the milk, cooking on low heat until thickened. Stir in the lemon juice, Dijon mustard, and smoked paprika.
3Pour the sauce over the layered chicken, ham, and cheese in the casserole dish.
4Mix together the melted butter, panko bread crumbs, and Italian seasoning, then sprinkle the mixture over the casserole.