Make Four Foil Packets By The Following Method, Using 1-Foot Squares Of Heavy Duty Aluminum Foil: Fold Square In Half And Smooth Flat. Seal Each Of The Narrow Ends By Folding Over Each Edge Three Times To Make A 1/4-Inch Border, Smoothing Flat After Every Fold. You Should Now Have A Foil Packet That Is Open On One Long Side. Repeat To Form Four Packets. In A Bowl Or Resealable Plastic Bag, Combine The Potatoes, Chicken Cubes, Red Peppers, Onion, Celery, And Barbeque Sauce; Mix Well. Evenly Divide The Mixture Among The Foil Packets. Roll Up The Open End Of The Packets To Seal. Place Packets On A Grill Over The Coals Of A Fire. Cook Until The Potatoes Are Tender And The Chicken Is Fully Cooked, About 25 Minutes, Depending On The Intensity Of The Heat.