Boil potatoes as jacket potatoes until just under cook. Drain, let cool, peel.
Grease the baking dish. Preheat the oven to 200 ° C.
Wrap each potato with 1 slice of ham. Place the potatoes side by side in the baking dish.
Heat the bechamel sauce (lazy people like me buy the ready-made). Dissolve the processed cheese (we like the corners with herbs best) in the sauce. Pour the sauce over the potatoes. Sprinkle everything with the grated cheese.
Put everything in the stove and bake at 200 ° C until the cheese crust is nice and brown and crispy on top.