In a medium bowl, mix flour, baking soda, and salt. Set aside.
In a large bowl, cream together butter, granulated sugar, and brown sugar until smooth.
Add the egg and vanilla extract to the butter mixture, and mix well.
Gradually add the dry ingredients to the wet ingredients, mixing until combined.
Fold in the marshmallows, chocolate chips, and crushed graham crackers.
Preheat your air fryer to 350°F (175°C).
Scoop cookie dough onto parchment paper or an air fryer-safe tray, leaving space between cookies.
Bake in the air fryer for 5-7 minutes or until golden brown.
Let the cookies cool slightly before serving.