Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a mixing bowl, whisk together the flour, baking soda, baking powder, salt, cinnamon, nutmeg, and ginger. Set it aside.
In another large mixing bowl, use an electric mixer to cream the softened butter, brown sugar, and granulated sugar together until light and fluffy.
Add the pumpkin puree, egg, and vanilla extract to the butter mixture, and continue to mix until well combined.
Gradually add the dry ingredients to the wet ingredients, mixing just until incorporated.
Stir in the graham cracker crumbs, mini marshmallows, and milk chocolate chips until evenly distributed.
Using a cookie scoop or spoon, drop rounded tablespoons of dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake in the preheated oven for 10-12 minutes or until the edges are set and the tops are lightly golden.
Remove from the oven and let cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.