Preheat the oven to 350 degrees Fahrenheit and line a baking sheet with parchment paper.

In a small mixing bowl, whisk together flour, baking soda, baking powder, pumpkin spice, and salt to combine and set aside.

In the bowl of a standing mixer, combine butter, brown sugar, pumpkin puree, and vanilla extract. Mix on medium speed until well combined, about 30 seconds to 1 minute.

Gradually add the dry ingredients to the wet ingredients, mixing on medium-low speed until just combined and no streaks of flour are visible. Scrape down the sides as necessary.

Fold in chocolate chunks with a spatula, reserving ? cup of chocolate chunks.

Scoop out balls of dough using a small cookie scoop, slightly flattening them to form a puck shape. Create nests with the graham cracker pieces on top and tuck the marshmallows and reserved chocolate pieces in between.

Bake for 14 minutes, then let the cookies sit on the baking sheet for an additional 5 minutes before transferring them to a cooling rack.