Preheat the air fryer to 390°F (200°C).
Place four graham cracker halves in a single layer in the air fryer basket.
Place one large marshmallow on top of each graham cracker half, pressing it down slightly to ensure it adheres.
Cook in the air fryer for 3 to 5 minutes, or until the marshmallows reach a golden brown color and a softened texture.
Carefully remove the toasted graham crackers and marshmallows from the basket using a spatula.
Immediately place a piece of chocolate on top of each hot marshmallow.
Place the remaining four graham cracker halves on top of the chocolate and press down gently to facilitate melting.