Slice the avocado in half, remove the pit, and scoop the flesh into a bowl. Add lime juice and salt. Mash with a fork to your desired consistency.
Set a cast iron skillet or non-stick pan on the camp stove over medium heat. Place tortillas or bread in the dry skillet. Toast for 1-2 minutes per side until golden and crisp. Remove and set aside.
For the black bean version: in a small bowl, mash the black beans with smoked paprika. Spread onto two toasted tortillas. Top with the mashed avocado mixture.
For the chicken salad version: in a small bowl, mix canned chicken, mayonnaise, and hot sauce. Spoon onto the remaining toasted tortillas. Top with the avocado mixture.
Serve immediately. If you have extra lime wedges, squeeze a bit more on top for freshness.