Prepare your taco meat or protein according to your preferred method. Cook ground meat with taco seasoning in a skillet until fully cooked. If using rotisserie chicken, simply shred it.
Chop all your toppings: dice the tomato, onion, and avocado. Drain and rinse the canned beans. Set everything out so assembly is fast and easy.
Place a single layer of tortilla chips (or thinly sliced sweet potato) on the bottom of your foil pan.
Add a layer of your desired toppings over the chips, including the taco meat, beans, onion, tomato, avocado, and green chiles.
Add a layer of shredded cheese over the toppings.
Repeat the layering - chips, toppings, cheese - until the pan is full.
Finish with a thick, generous layer of shredded cheese on the very top.
Cover the pan with a piece of heavy-duty aluminum foil and crimp it tightly around all the edges to seal in the heat.
Place the covered pan on a grate over the campfire or on a grill set to medium heat. Do NOT place it directly over an open flame, or the bottom will burn.
Cook for 15 to 30 minutes depending on the temperature of your fire. Sweet potato nachos will need closer to 25 to 30 minutes. Tortilla chip nachos are typically ready in 15 to 20 minutes.
Carefully peel back a corner of the foil to check doneness. The cheese should be fully melted and bubbling, and all toppings should be hot and tender.
Use tongs or oven mitts to carefully remove the pan from the fire. Allow to cool for a few minutes before serving - the pan will be very hot.
Add any cold toppings such as sour cream, fresh salsa, or extra guacamole right before eating. Serve directly from the foil pan.