01 - Preheat oven to 350°F. Line a 9x9-inch baking pan with parchment paper or lightly grease to prevent sticking.
02 - In a medium bowl, whisk together flour, baking powder, baking soda, salt, ground ginger, cinnamon, nutmeg, and cloves until evenly mixed.
03 - In a large bowl, whisk together pumpkin puree, brown sugar, vegetable oil, molasses, eggs, and vanilla extract until smooth and unified.
04 - Gradually fold dry ingredient mixture into wet ingredients, stirring gently just until no streaks remain. Avoid overmixing.
05 - Gently fold in chocolate chips, reserving a small handful to sprinkle on top.
06 - Spread batter evenly into the prepared baking pan. Sprinkle reserved chocolate chips over the surface.
07 - Place pan in oven and bake for 23 to 27 minutes, or until a toothpick inserted in the center emerges clean or with moist crumbs.
08 - Allow bars to cool completely in the pan before cutting into 16 squares.