cream together butter brown sugar and granulated sugar. add vanilla and eggs and mix until fully combined.
add flour, baking soda, and salt. mux together until there is no visible flour left at all.
rough chop graham crackers then add them as well as the chocolate chips and mini marshmallows to the cookie dough and fold it all in.
using a cookie scoop or a tablespoon, spoon cookies out onto a lined cookie sheet leaving a 2" between them.
bake in the oven for 7 min remove and top with a few marshmallows then place back in the oven for an additional 2-3 minutes or until marshmallows have browned and the cookie is nice and golden in color.
allow cooling on cookie sheet for 5 min then transfer to a cooling rack to cool completely.