Creating these Pumpkin Whoopie Pies is straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Line two baking sheets with parchment paper.
2. Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking soda, baking powder, cinnamon, nutmeg, ginger, and salt. Set aside.
3. Combine Pumpkin Mixture: In a large mixing bowl, combine the pumpkin puree, brown sugar, and granulated sugar. Mix until well combined.
4. Add Wet Ingredients: Slowly incorporate the vegetable oil and vanilla extract into the pumpkin mixture. Beat in the eggs one at a time until fully combined.
5. Combine Mixtures: Gradually add the dry mixture to the wet mixture, stirring until just combined and no dry flour is visible.
6. Scoop Batter: Using a tablespoon or cookie scoop, drop rounded mounds of batter onto the prepared baking sheets, leaving about 2 inches between each mound.
7. Bake: Bake in the preheated oven for 15-20 minutes or until the tops are set and a toothpick inserted comes out clean. Let them cool on the baking sheet for a few minutes before transferring to wire racks.
8. Prepare Frosting: In another bowl, beat the cream cheese and unsalted butter together until smooth. Gradually add the powdered sugar and vanilla extract, mixing until the frosting is creamy. Add milk if needed for desired consistency.
9. Frost Pies: Once the whoopie pie cookies have cooled completely, flip half of them over. Spread frosting generously on the flat side and place another cookie on top, flat side down, to create a sandwich.
10. Serve and Enjoy: Your Pumpkin Whoopie Pies with Cream Cheese Frosting are now ready to enjoy!