Pre-heat grill to medium-high heat or preheat the oven to 375 degrees.
Using a sharp knife or mandolin with protective gloves, cut your potatoes into ¼ inch slices.
Toss potatoes, onion, olive oil, Italian seasoning, parmesan, half of the chives, salt and pepper in a bowl. Generously add the cracked pepper.
Make your foil squares by ripping off 4 pieces of foil from a 12 inch foil roll. Rip off about 12 inch squares.
Divide the potato mixture and mound in the center of the foil.
Place on hot grill and cook for 30-40 minutes. If making in the oven, put the foil packets on a sheet pan.
Once the cooking time has passed, open the potatoes and check for doneness. Once they are done, and add the shredded cheese to top. Close packets back up and continue to cook just until cheese is melted for about five minutes.
Garnish with the remaining chives. Serve immediately in the individual foil packets!