Preheat the oven to 375 degrees, preheat the grill or start the campfire.

Slice the potatoes, carrots and onions all in about ¼ inch thin slices. Place in a large bowl or gallon zip top bag, add the oil and seasoning salt, and mix well.

In a large bowl, mix together the ground beef, salt and pepper. Form four hamburger patties that you press flat with your hands.

Cut 8 large pieces of foil that are about 20 inches long each. Lay a piece of foil longwise up and down and a second piece of foil left to right to form a giant plus sign. Place ¼ of the potato mixture in the center of the foil. Add one hamburger patty on top of the vegetables.

Pull the two sides from the top layer of foil up to meet each other. Fold the foil down until you reach the burger, then lay the foil flat. Bring the other two sides of the foil up to meet and roll the edges down. Roll the final loose edges in on both sides of the foil to form a large packet.

Cook the burger packets over medium heat until the burger reaches at least 160 degrees and the potatoes are tender, usually about 30-40 minutes. Add the cooked bacon and cheese, and roll them back up, heating for an additional 2-3 minutes until the cheese has melted.

Alternatively, bake in the oven on a sheet pan for 30-40 minutes or until the burger is cooked to at least 160 degrees and potatoes are fork tender. Add cheese and cooked bacon if desired, then roll the packet closed again for 2-3 minutes until the cheese melts.