In a large bowl, or a large zip-top bag, combine the chicken, onion, mushrooms, yellow pepper, red pepper, garlic, and potatoes. Pour in the Bacon Up and lemon juice, then mix well.
Evenly divide the mixture between 4 large sheets of aluminum foil. Top each with another sheet of foil, and roll up the edges tightly. Wrap each packet again, securely in another sheet of foil to double wrap.
Cook in the hot coals of a campfire until the chicken is opaque and the potatoes are tender, around 40 minutes.