Preheat the oven 350-degrees;Grease a 9x13 baking pan and set it aside.
In a medium bowl, cream together the sugar and butter.
Beat in the egg and vanilla until combined, then add in the pumpkin
Mix in the dry ingredients until the mixture is creamy, but thick. Fold in the chocolate chips - the milk and dark play very nicely with the pumpkin!
Spread the batter evenly in the prepared pan. Bake for about 35-40 minutes until the sides start to pull away from the sides.
Cool completely in the pan.
Refrigerate overnight in the pan.
Cut the bars in the pan and serve. Store leftovers in an airtight container.