Preheat oven to 350 degrees and line baking sheet with parchment paper.
For the pies, mix cashew butter & pumpkin together. Add in eggs and mix till combined. Mix in baking soda, cinnamon & vanilla.
Using a tablespoon, drop the mixture onto parchment paper.
Bake for 10 minutes, remove from oven and let cool.
In a mixing bowl, combine cream cheese & butter with a hand blender on low speed. Add in vanilla, powdered sugar and milk and continue blending till creamy. Place filling in fridge for 10 minutes until firm.
To assemble pumpkin whoopie pies, take one pumpkin cookie and spoon cream cheese filling on the flat side. Place another pumpkin cookie on top, making a sandwich. Repeat till all whoopie pies are assembled.