Preheat oven to 375 degrees F.
Whisk together flour, baking soda, salt in a medium bowl. Set aside.
Using a mixer, cream together butter and sugars until light and fluffy in another bowl.
Add vanilla, then add eggs one at a time, beating after each addition.
Slowly beat in flour mixture until just incorporated.
Fold in the milk chocolate and semi-sweet chocolate chips and 1 cup of marshmallows.
Line a 13x18 sheet pan with parchment paper, spraying the parchment with non-stick cooking spray.Lay out graham crackers on baking sheet leaving no gaps between them.
Place small scoops of cookie dough on the graham crackers, using an ice cream scoop and spread dough out a little by flattening with back side of scoop or spoon.
Bake for 5 minutes without disturbing.