Preheat your oven to 350°F (175°C) and grease a baking pan.
In a large bowl, mix together pumpkin puree, sugar, brown sugar, and vegetable oil.
Add eggs one at a time, mixing well after each addition.
Stir in the vanilla extract until combined.
In another bowl, whisk together flour, cocoa powder, baking powder, salt, and cinnamon.
Gradually add the dry ingredients to the wet mixture, stirring until just combined.
Fold in the chocolate chips evenly into the batter.
Pour the batter into the prepared baking pan and spread evenly.
Bake for 25-30 minutes or until a toothpick inserted comes out clean.
Allow the brownies to cool before cutting into squares.