Preheat the oven to 350°F. Set aside. In a large bowl, sift together the flour, pumpkin pie spice, baking soda and salt.
In another large bowl, mix the egg, pumpkin puree, vegetable oil, sugars, and vanilla. Slowly add in the flour mixture and mix until combined. Fold in the chocolate chips.
Spray or butter a 9×13? baking dish. Then pour into the prepared baking dish.
Bake for 35 to 40 minutes, or until a toothpick comes clean. Allow to cool for 20 minutes in pan and then remove from pan. Cut into bars and enjoy!