01 -  Preheat the oven to 350°F. Line a 9x9-inch baking pan with parchment paper or lightly grease it. 
 02 -  In a medium bowl, whisk together the flour, baking powder, baking soda, salt, ginger, cinnamon, nutmeg, and cloves until evenly blended. 
 03 -  In a large bowl, whisk pumpkin puree, brown sugar, vegetable oil, molasses, eggs, and vanilla extract until smooth and thoroughly combined. 
 04 -  Gradually fold the dry mixture into the wet ingredients until just combined, taking care not to overmix. 
 05 -  Gently fold in the chocolate chips, reserving a small handful to sprinkle over the top, if desired. 
 06 -  Spread the batter evenly into the prepared pan and sprinkle remaining chocolate chips across the surface. 
 07 -  Bake for 23 to 27 minutes, or until a toothpick inserted in the center comes out clean or with a few moist crumbs. 
 08 -  Allow to cool completely in the pan. Slice into 16 bars when fully cooled.