Spray each sheet of foil with cooking spray. Top each piece with equal portions of potatoes, bacon, 1 packet onion soup powder and mix. Add salt and pepper to taste. Add 1 tablespoon of butter to each serving. Wrap securely.
Grill for 20 to 30 minutes. Or you can bake it in the oven, at 350° for about 35 minutes or till done. Let stand 10 minutes before serving. Serve in foil, topped with sour cream if desired.