Preheat your oven to 350°F and line a cookie sheet with parchment paper.
In a large bowl, beat the butter, brown sugar, and granulated sugar together until smooth.
Add in the pumpkin puree, egg, and vanilla. If you want a brighter orange color, you can add a drop or two of food coloring.
In a separate bowl, whisk together the flour, baking soda, pumpkin pie spice, and salt.
Slowly mix the dry ingredients into the wet ingredients until just combined.
Crush the graham crackers in a storage bag, then fold them into the dough along with the chocolate chips and mini marshmallows.
Scoop the dough onto your baking sheet using a 2-inch cookie scoop.
Bake for 12–14 minutes, or until the edges are set. Let them cool for a few minutes before transferring to a wire rack.