In a medium bowl, whisk together flour, pie spice, baking soda and salt. Set aside.
With an electric mixer, cream butter and sugar on medium-high until smooth.
Beat in egg and vanilla until combined.
Mix in pumpkin puree and gradually pour in the dry ingredients and mix to combine.
Stir in the chocolate chips.
Pour into your prepared pan and bake for 25 minutes or until you pierce with a toothpick in the center of the bars and it comes out clean.
Cut into bars and serve!
