Preheat your oven to 350°F (175°C). Line baking sheets with parchment paper.
In a large bowl, whisk together the flour, baking powder, baking soda, cinnamon, ginger, cloves, and salt.
In another bowl, mix the vegetable oil, brown sugar, and granulated sugar until combined. Add the pumpkin puree, eggs, and vanilla extract. Mix well.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Drop spoonfuls of batter onto the prepared baking sheets, spacing them about 2 inches apart. Bake for 10-12 minutes or until the cookies are set. Let them cool on the baking sheets for a few minutes before transferring to a cooling rack.
For the filling, beat the softened butter until creamy. Gradually add the powdered sugar and beat until smooth. Add the vanilla extract and marshmallow fluff, and mix until well combined.
Once the cookies are completely cool, spread or pipe the filling onto the flat side of one cookie and top with another cookie to make a sandwich.