Preheat your oven to 350 degrees F and line a 9x13in baking pan with parchment paper. Alternatively, you can spray a pan with nonstick spray. Set aside.
In a large bowl, whisk together the pumpkin puree, butter, brown sugar, 1/4 cup granulated sugar, eggs, and vanilla extract until smooth.
Add the flour, baking powder, pumpkin pie spice, and salt. Combine until just mixed through. Add both chocolate chips. Stir to combine.
Pour the batter into your prepared pan. Whisk together the remaining 1/4 cup sugar with the ground cinnamon. Top the bars with the cinnamon and sugar mixture. Bake the bars for 20-25 minutes or until the center is set and a toothpick comes out mostly clean.
Let the bars cool in the pan for 10 minutes. Remove them from the pan, and let cool for another 30 minutes. Slice into bars and serve. Alternatively, you may stick the bars in teh fridge for 30 minutes in order to get a more clean cut. The bars with keep for 3-4 days at room temperature or for about a week in the fridge.