In a large mixing bowl, combine the sliced chicken, bell peppers, onion, and minced garlic.
Drizzle the mixture with olive oil, ensuring all ingredients are evenly coated.
Sprinkle chili powder, paprika, ground cumin, garlic powder, onion powder, salt, and pepper over the chicken and vegetables. Toss everything together until well mixed.
Lay out the aluminum foil sheets and evenly divide the chicken and vegetable mixture among them.
Squeeze lime juice over each portion and fold the foil over the ingredients, sealing the edges to form a packet.
Place the foil packets on a grill over the campfire or on a camping stove, cooking for about 15-20 minutes, turning halfway through the cooking time.
Carefully open the packets (watch out for the steam), check that the chicken is fully cooked, and if so, garnish with fresh cilantro.
Serve hot, directly from the foil packets, for a rustic and enjoyable camping meal.