In a medium mixing bowl, combine the chicken and BBQ sauce. Mix well. Lay 4 large sheets of foil on a flat surface and lightly spray with non-stick spray. Divide chicken and BBQ mix between each of the 4 foil sheets.
Top with green pepper and onion, dividing evenly between all 4 foil sheets. Sprinkle each with salt. Tightly fold in all four sides so the foil creates a pocket and is sealed tightly.
Place on grill and cook with the grill lid closed, for 20 to 30 minutes or until chicken is cooked through. Vent the foil packet before opening by poking each with a knife to release steam. Serve with your favorite veggie side dish!