Lay the cheese slices on a baking sheet lined with parchment paper, arranging them so they overlap and form a rectangle.
Sprinkle the shredded cheese on top.
Melt the cheeses together in a preheated oven at 180°C (356°F) for a few minutes, just until they fuse.
Separate the boiled eggs. Mash the yolks in a bowl with the butter, season with salt and pepper, and mix in the mustard.
Finely chop the egg whites and mix them with the cream cheese and the chopped herbs.
Once the cheese layer has cooled, spread the egg white mixture evenly on top.
Lay the turkey slices over the entire surface.
Spread the egg yolk mixture over the ham layer.
Using the parchment paper (or not), roll the cheese sheet up tightly into a log.
Chill in the refrigerator for a few hours, then slice and serve!