Preheat the oven to 350°F (175°C). Line an 8x8-inch baking dish with parchment paper.
Whisk together the flour, baking soda, pumpkin pie spice, and salt in a medium bowl.
In a separate bowl, mix the granulated sugar, brown sugar, and melted coconut oil until smooth. Add the egg, pumpkin purée, and vanilla extract, and mix well.
Fold the dry ingredients into the wet mixture until just combined. Be careful not to overmix.
Gently stir in the chocolate chips.
Spread the batter evenly into the prepared baking dish.
Bake for 25-30 minutes or until a toothpick inserted in the center comes out clean.
Let the bars cool in the pan before slicing into squares and serving.