Preheat the air fryer to 350°F.
In a bowl, mix the graham cracker crumbs with melted butter until well combined.
Place half of the mixture into the bottom of a small baking dish or a piece of aluminum foil shaped into a bowl.
Layer two chocolate squares on top of the crumbs.
Place two marshmallows on top of the chocolate.
Sprinkle the remaining graham cracker mixture over the marshmallows.
Carefully place the dish or foil in the air fryer basket.
Cook for 5 minutes, or until the marshmallows are golden brown and the chocolate is melted.
Remove from the air fryer and let cool for a minute before serving.
