Preheat oven to 375 degrees F. Line 2 cookie sheets with parchment paper.
In a medium bowl, combine the flour, salt, baking powder and baking soda. Stir to combine.
In the bowl of a stand mixer, beat together butter and sugars on medium-high speed until fluffy.
Add eggs to sugar mixture and beat until fully incorporated. Then add in vanilla and beat until combined.
Add the flour mixture to the sugar mixture and stir until combined.
Stir in the chocolate chunks, golden grahams cereal and marshmallows until evenly distributed throughout the dough.
Divide dough into 12 equal parts and roll into balls. Place 6 dough balls on each cookie sheet.
Bake for 20 minutes or until cookies are brown around the edges and puffed up.