Preheat the oven:
Preheat your oven to 325°F (160°C). Generously grease a 9×13-inch baking pan and set aside.
Mix dry ingredients:
In a small bowl, whisk together the flour, pumpkin pie spice, baking soda, and salt until well combined.
Cream the butter and sugar:
In a separate large bowl, cream together the softened butter and sugar until light and fluffy. Add the egg and vanilla extract, and mix well. Then, beat in the pumpkin puree until fully incorporated.
Combine wet and dry ingredients:
Gradually add the dry ingredients to the wet mixture, stirring until well combined.
Fold in the chocolate chips:
Gently fold the chocolate chips into the batter. Spread the batter evenly into the prepared baking pan.
Bake:
Bake in the preheated oven for about 30 minutes, or until the edges begin to pull away from the pan and a toothpick inserted into the center comes out clean.
Cool and serve:
Allow the bars to cool completely in the pan before cutting them into squares. Enjoy!