Preheat oven to 375°F (190°C) and line baking sheets with parchment paper.
In a large bowl, cream together the softened butter, brown sugar, and white sugar until light and fluffy.
Mix in the pumpkin puree and vanilla extract until well combined.
In a separate bowl, whisk together flour, baking soda, salt, cinnamon, nutmeg, and ginger.
Gradually add the dry mixture to the wet mixture and stir until just combined.
Fold in graham cracker crumbs, mini marshmallows, and chocolate chunks.
Scoop cookie dough onto the baking sheets using a medium cookie scoop or tablespoon.
Bake for 10-12 minutes or until the edges are set but the centers are soft.
Let cookies cool on the baking sheet for 5 minutes before transferring to a wire rack.