Preheat grill for medium heat. Take two pieces of heavy-duty aluminum foil and spray with nonstick cooking spray. Divide the potatoes and sweet onions and place equally on the two pieces of foil. Place 1 tablespoon of butter on each and then top generously with seasoned salt and pepper. Fold the foil tightly and place on grill for about 45 minutes or until done.
2 medium sized potatoes, washed and cubed
2 tbsp butter, sliced
1 medium sweet onion, diced
Heavy Duty Aluminum Foil
Nonstick cooking spray