Mix the flour, salt, baking powder and cornstarch in a large bowl.
Gradually add the flour mixture to the batter, stirring after each addition.
Once incorporated, add the chocolate chips, 1 ½ cups marshmallows, ¾ cups graham crackers and half the broken candy bars. Fold to combine.
Place a parchment liner in the air fryer basket and lightly spritz liner with oil.
Use a cookie scoop to portion about 1.5 tablespoons of dough. Place dough balls in the air fryer basket, leaving space between each dough ball for the cookies to expand.
Cook at 350 degrees F for 8 minutes.
Pull the air fryer basket out and top each cookie with 1-2 marshmallows, 1-2 cracker pieces and 1-2 pieces of broken candy bar.
Continue cooking at 350 degrees F for 3 more minutes or until cookies are golden brown. To tell if they are cooked through, stick a toothpick in the center of a cookie - if it pulls out clean it’s done.
Allow cookies to cool in the basket for 2-3 minutes before transferring to a baking rack to finish cooling.
Notes
Store cooled leftover cookies at room temperature in an airtight container for up to 4 days.
To freeze: place cooled cookies in a freezer container or bag and store for up to 1 month. Defrost at room temperature.
Oven directions: prepare dough as directed. Place dough balls on parchment lined baking sheet and bake at 350 degrees F for 8-12 minutes.
See blog post for more helpful tips and recipe variations.