Preheat Oven: Preheat your oven to 350°F (175°C). Grease or line a 9x13-inch baking pan with parchment paper.
Mix Wet Ingredients: In a large mixing bowl, whisk together the pumpkin puree, brown sugar, granulated sugar, vegetable oil, eggs, and vanilla extract until smooth and well combined.
Mix Dry Ingredients: In another bowl, whisk together the flour, baking soda, baking powder, cinnamon, nutmeg, ginger, and salt.
Combine Wet and Dry Ingredients: Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Be careful not to overmix.
Fold in Chocolate Chips: Gently fold in the chocolate chips, reserving a handful to sprinkle on top if desired.
Pour into Pan: Spread the batter evenly into the prepared baking pan. Sprinkle the reserved chocolate chips on top.
Bake: Bake in the preheated oven for 25-30 minutes, or until a toothpick inserted into the center comes out clean or with a few moist crumbs.
Cool and Serve: Allow the bars to cool in the pan for at least 10 minutes before slicing into squares.