Begin by setting your air fryer to 350°F to preheat.
Take the graham crackers and break them into squares, yielding 8 pieces in total.
Lay 4 of the graham cracker squares on a clean surface and place a piece of chocolate on each.
Pile a generous amount of mini marshmallows on top of the chocolate, creating a fluffy layer.
Cap each creation with another graham cracker square, forming a delightful sandwich.
Lightly brush the tops of these s'mores with the melted butter, then give them a quick spritz with cooking spray for an extra crispy finish.
Arrange the s'mores in the air fryer basket, ensuring they have enough space to cook evenly.
Cook for about 4-5 minutes, watching closely until the marshmallows puff up and turn a lovely golden brown while the chocolate melts beautifully.
Once done, carefully take the s'mores out of the air fryer and allow them to cool for a minute before indulging.