In a medium bowl, combine the turkey, celery, thyme and paprika.
In a small bowl, combine the ground bread and milk and then squeeze the crumbs as you transfer them to the meat mixture.
Mix in the egg, parmigiano-reggiano and parsley and season with salt and pepper.
Spread a foot-long piece of wax paper on a work surface. Using a rubber spatula, spread half the meat mixture on the wax paper to form an 8-inch-square. Top with the ham and swiss cheese, then the remaining meat mixture, forming the same square shape.
Seal the edges to enclose.
Cut into 4 square patties and coat each in the bread crumbs.
In a large skillet, heat 1 inch olive oil over medium-high heat. Add the patties and fry turning once, until browned, about 10 minutes.