(Optional) Preheat your pie irons over the fire while getting your supplies ready.
Lightly beat one egg, then add salt and pepper.
Butter the insides of your pie iron.
Insert a slice of bread on the lower half of the cooker and create a small indentation in the bread. Add a slice of bread to the other side of the pie iron as well.
Pour your egg into this indentation and place the slice of cheese on your other slice of bread. If you wish, adding a slice of precooked sausage or some slices of cooked bacon at this point is quite tasty.
Carefully close your cooker, making sure to latch it.
Continue with your remaining ingredients to create additional sandwiches.
Cook pie irons over your fire, turning frequently, until egg is set and your cheese is melted.