Slice the large square marshmallows in half lengthwise so they're not as thick.
If you sliced the marshmallows in half, press the marshmallow sticky side down onto the graham cracker halves. Make sure they're firmly stuck otherwise they'll come off of the cracker partially or completely. See picture above for proof.
Place in the air fryer at 360 degrees F for 3 minutes until the tops are golden brown.
Break off a strip of 3 chocolate rectangles on the candy bar and place the strip on the hot marshmallow.
Immediately place the other half of the graham cracker on top of the chocolate and gently press down.
Use a spatula and carefully move the smores to a plate.
Let the chocolate melt slightly and enjoy.
Notes
You can use 2 regular marshmallows cut in half to make 4 pieces on your graham cracker square.