Set the air fryer to 390°F.
Place marshmallow halves, cut-side down, on to graham crackers. Press down gently so they stick.
Arrange the graham crackers in the air fryer, as well as an equal number (4) of plain graham crackers. You may need to cook in batches, depending on the size of your appliance. Close and cook for one and a half minutes, or until the marshmallows are golden brown.
Remove the graham crackers with the marshmallows from the air fryer. Place a piece of chocolate on each plain graham cracker. Let the chocolate sit for a few seconds to soften, then return the chocolate graham crackers to the air fryer for around 30 seconds or until the chocolate is melted - keep a close eye to make sure it doesn't burn!
Press one graham cracker with marshmallow on to one with melted chocolate, and repeat until you've used them all. Serve, and enjoy!