Preheat the oven to 350 degrees Fahrenheit.
Grease a 9"x13" baking pan or spray with nonstick baking spray.
In the bowl of an electric mixer, mix together butter, eggs, canned pumpkin, vanilla, brown sugar, and granulated sugar, scraping down the sides with a spatula in between. Mix well.
In a separate bowl, whisk together salt, baking soda, baking powder, cinnamon, pumpkin pie spice, and flour.
Add the flour mixture to the wet mixture and mix just until combined, scraping down the sides with a spatula in between.
Stir in 1 1/2 c. semi-sweet chocolate chips with a spatula.
Pour and spread the batter evenly into the prepared pan.
Sprinkle the top with 1/2 c. chocolate chips and lightly press them into the batter.
Bake for approximately 27-30 minutes (mine were done in 27), or just until a toothpick inserted into the center comes out clean. Moist crumbs are good, but you don't want gooey-ness.
Allow the bars to cool to room temperature, then slice and serve.