Preheat the oven to 350°F. Peel the potatoes, cut them in half, and put them on a sheet pan lined with parchment paper. Drizzle olive oil over the potatoes and season them with salt and pepper. Transfer the pan to the oven and cook for 25 minutes – the potatoes should be softened and have a little bit of color afterwards.
Put the white bread slices on top of each other and cut them into small cubes. Spread them on a sheet pan and dehydrate them in the oven at 300°F for about 10 minutes.
Allow the potato halves to cool a bit and then hollow them out with a spoon.
Put the insides of the potatoes you just scraped out into a bowl and mix with heavy cream and shredded cheese. Spoon the mixture back into the hollowed-out potato halves.
Take 2 potato halves and press them back together to form a whole potato. Repeat with the rest of the potatoes.
Add the ground beef, bread crumbs, eggs, heavy cream, salt, and pepper to a bowl and mix well.
Cover each potato with some of the beef mixture and seal it.
Press the potato meatballs into the croutons and fry them in hot oil at 325°F.