Preheat oven to 350 degrees F. Line a baking sheet with parchment paper and set aside.
In a medium bowl, whisk together the oats, oat flour, baking powder, salt and pumpkin pie spice.
In a separate bowl, or in a blender, mix together the mashed banana, pumpkin puree, almond butter and vanilla extract. The mixture should be finely mixed together, without visible chunks of banana. Pour the banana-pumpkin mixture into the oat bowl and mix together.
Using a small cookie scoop or spoon, drop the mixture onto the prepared baking sheet, 2 inches apart. Bake for 12-14 minutes, or until slightly golden. Remove from oven and let cool completely on an oven rack.