Preheat the oven: Set your oven to 350°F and line a baking sheet with parchment paper.
Cream the butter and sugars: Beat butter, brown sugar, and granulated sugar together until the mixture is light and fluffy.
¾ cup brown sugar, ¼ cup granulated sugar, 1 cup unsalted butter
Mix in wet ingredients: Add pumpkin puree, egg, and vanilla extract. Stir until everything is well blended.
½ cup pumpkin puree, 1 teaspoon vanilla extract, 1 large egg
Combine the dry ingredients: In a separate bowl, whisk together flour, baking soda, pumpkin pie spice, and salt.
2 ¼ cups flour, 1 teaspoon baking soda, 1 teaspoon pumpkin pie spice, ½ teaspoon fine salt
Mix wet and dry ingredients: Gradually add the dry mixture to the wet mixture, stirring just until combined.
Fold in mix-ins: Gently mix in chocolate chips, marshmallows, and graham cracker pieces.
1 cup semi-sweet chocolate chips, 1 cup mini marshmallows, 8 graham crackers
Scoop the dough: Drop tablespoons of dough onto the prepared baking sheet, adding extra toppings if desired.
Bake the cookies: Bake for 12–14 minutes, or until the edges are golden. Let cookies cool on the baking sheet for a few minutes before transferring them to a wire rack.
Serve: Enjoy your pumpkin s'mores cookies at room temperature!