Divide the potatoes, butter and bacon into 4 and place in the middle of each sheet, sprinkle the seasoning salt over the top; fold the tinfoil to enclose.
Cook on the grill of a campfire, BBQ or a 400 degree oven until the potatoes are tender, approximately 25 minutes. Shake and turn the tinfoil packet every few minutes to avoid burning.
Remove the packet from the heat and open carefully.
Portion out the potatoes onto plates OR leave them into the packages, like we do. No dishes!
Top with the (divided into 4) onion, cheese, sour cream and salt/pepper.