Preheat your Air Fryer to 350 degrees for 3 minutes.
Mix butter and sugars into a mixture.
Add the eggs and vanilla. Mix.
Mix the salt, baking powder, cornstarch, and flour in a separate bowl.
Slowly mix flour mixture into the batter.
Once incorporated, add your chocolate chips, 1 ½ cups marshmallows, ¾ cup crackers, and broken candy bars. Fold.
Using a cookie scoop, make 4” balls of batter. Place in air fryer basket on top of parchment paper. Leave space to expand.
Cook at 350 degrees for 8 minutes.
Stop, and pull out the air fryer basket—top cookies with 1 or 2 marshmallows, 1 or 2 cracker bits, and broken candy bars.
Continue cooking at 350 degrees for 3 minutes or until golden brown. You can make sure they are thoroughly cooked by sticking a toothpick in the center of a cookie. If it pulls out clean, it is done!
Transfer cookies to a baking rack to cool.