Preheat your campfire grill or set up a campfire with a grate over the flames.

Divide the seasoned meat, sliced bell peppers, and onions evenly among four large pieces of aluminum foil.

Season the meat and vegetables with salt and pepper to taste.

Fold the foil around the ingredients to create four secure packets, ensuring there are no openings for the contents to spill out.

Place the foil packets on the grill or over the campfire, ensuring they are positioned on a stable surface.

Cook for approximately 15-20 minutes, flipping halfway through, or until the meat is cooked through and the vegetables are tender.

Carefully remove the foil packets from the heat using tongs or heat-resistant gloves.

Open the foil packets carefully to release the steam.

Serve the fajita filling hot, either directly from the foil packets or transferred onto tortillas for easy wrapping.

Garnish with your favorite toppings such as salsa, sour cream, or guacamole, if desired.