Preheat grill to medium high heat.
Prepare foil packets. Lay out 4 large pieces of heavy duty foil then top each with a large piece of parchment paper (or spray with non stick spray).
Place equal amounts of sliced potatoes and onions in the middle of each packet. Drizzle with oil and sprinkle with seasoning salt and pepper.
Place a chicken breast on top of potatoes. Brush each side of each chicken breast with barbecue sauce.
Wrap up each foil packet by bringing two sides together and rolling it up. Then roll up each open end to seal the packet.
Place on hot grill and cook (potatoes down) for about 25 minutes or until potatoes are tender and chicken is cooked through (chicken should be 165°F).
Cut open packet, brush chicken with more barbecue sauce if desired and top with cheddar cheese and bacon bits. Place back on grill (do not reseal) to melt about 5 minutes.
Garnish with sour cream and chives.
(Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.)