Preheat the pie iron over the hot coals of your campfire.
Remove carefully and lay on heat-resistant surface, being careful not to touch the hot iron. Butter or spray both inside sides of the pie iron.
Butter both slices of bread. Place one slice of bread, buttered side down, into the pie iron.
Top with any desired s’mores toppings. You can go for the classic s’mores combination with marshmallows, chocolate chips, and crushed graham crackers; or add your own favorite ingredients such as chocolate-hazelnut spread, coconut flakes, peanut butter, sliced bananas, or white chocolate.
Top your sandwich with the second slice of bread, buttered side up, and close the pie iron.
Stick pie iron directly on the hot coals of your fire, cooking for 5-6 minutes, rotating often.
Once finished, remove from the fire. Carefully remove the pie, transfer to a serving tray and cut in half. Allow the pies to cool slightly before eating.