Preheat oven to 350°F (180°C) and line a baking sheet with parchment paper. In a bowl, whisk pumpkin puree, egg, and vanilla until smooth.
In a separate bowl, combine flour, oats, sugar, baking powder, baking soda, cinnamon, pumpkin spice, salt, and chocolate chips.
Add the dry ingredients to the wet ingredients and mix well. The dough will be very thick.
Scoop onto the baking sheet and gently flatten each cookie.
Bake for 13–15 minutes, until lightly browned around the edges.
Cool on the baking sheet for at least 5 minutes, then transfer to a wire rack.