Set a cast iron skillet over your campfire or camp stove. Place the bacon in the skillet and cook over medium-low heat, flipping occasionally, until crispy. Remove and place on a paper towel-lined plate.

Toast/fry the bread in the skillet, flipping after about a minute so that both sides are browned. Remove and set aside.

If needed, add a bit more fat to the skillet. Crack an egg into the skillet and cook to your liking.

To assemble the sandwich, slice the avocado in half, scoop out the middle, and mash it on both slices of bread. Layer the bacon on one side, the egg on the other, and season with salt & pepper.