Creating these Bite-Sized Pumpkin S’mores Cookies is a straightforward and enjoyable process. Follow these steps to bake your delicious cookies:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
2. Mix Dry Ingredients: In a medium bowl, combine the flour, oats, baking powder, baking soda, pumpkin pie spice, and salt. Whisk well to ensure even distribution.
3. Cream Butter and Sugars: In a large bowl, beat the softened butter, brown sugar, and granulated sugar together until creamy and smooth.
4. Add Egg and Vanilla: Mix in the egg and vanilla extract until fully incorporated.
5. Incorporate Pumpkin: Add the pumpkin puree to the wet mixture and stir until well combined.
6. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Do not overmix.
7. Fold in Chocolate and Marshmallows: Gently fold in the mini chocolate chips and mini marshmallows until evenly distributed throughout the dough.
8. Scoop Cookies: Using a small cookie scoop or spoon, drop rounded tablespoons of dough onto the prepared baking sheet, spacing them about 2 inches apart.
9. Top with Graham Cracker Crumbs: If desired, sprinkle a little graham cracker crumbs on top of each cookie for added flavor and texture.
10. Bake: Place the baking sheet in the preheated oven and bake for 15-20 minutes, or until the edges are lightly golden.
11. Cool: Remove the cookies from the oven and allow them to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.

These steps will guide you in creating these incredible cookies that everyone will love.