Fold a 36 x 18-inch piece of heavy foil in half to make a 18-inch square. Lightly coat one side of the square with nonstick cooking spray. On coated surface, arrange half of the bacon in the center of the foil. Top with half of the potatoes, half of the sweet pepper, half of the onion , and half of the cheese. Top with remaining potatoes, remaining sweet pepper and remaining onion. Sprinkle with seasoned salt and black pepper. Top with remaining cheese and remaining bacon.
Lightly coat one side of another 18-inch square piece of double thickness heavy foil with the non-stick cooking spray; place it, coated side down , on top of potato stack. Seal all edges with a double fold, leaving space for steam to build. Grill vegetable packet on the grill rack of an uncovered grill directly over medium coals for 20 to 25 minutes or until potatoes are tender, turning the packet once.