Preheat oven to 350°F and line a baking sheet with parchment paper.
In a large bowl, cream together butter, brown sugar, and granulated sugar until fluffy.
Mix in the pumpkin purée and vanilla extract until well combined.
In a separate bowl, whisk together flour, baking soda, salt, and pumpkin pie spice.
Gradually add dry ingredients to wet ingredients and mix until a soft dough forms.
Fold in chocolate chips, graham cracker pieces, and marshmallows.
Scoop dough onto the prepared baking sheet using a cookie scoop, spacing 2 inches apart.
Top each dough ball with extra marshmallows for a gooey finish.
Bake for 10-12 minutes or until edges are golden brown and centers are set.
Cool on the pan for 5 minutes before transferring to a wire rack to cool completely.