Mix the flour, baking powder, baking soda, corn starch, and salt in a large bowl.
In another bowl, mix the butter, sugar, and brown sugar, mix until fluffy, then add the eggs and pure vanilla extract.
Fold in the wet ingredients into the dry ingredients, mix well until smooth.
Fold in the chocolate chips, marshmallows, diced chocolate bar, and crushed graham crackers. Mix well, and then refrigerate for about 30 minutes.
Line your air fryer basket with parchment paper, and then using a cookie scoop, add about two tablespoons of cookie batter on top. Set the temperature to 320 degrees F, air fryer setting, for 5 to 7 minutes. Remove when the edges start to brown.
Plate, serve, and enjoy!