01 -  Preheat the oven to 350°F. Line a 9x9-inch baking pan with parchment paper, ensuring an overhang for easy removal. 
 02 -  In a medium mixing bowl, whisk together the flour, baking powder, baking soda, salt, cinnamon, ginger, nutmeg, and cloves until well combined. 
 03 -  In a large bowl, whisk together the pumpkin puree, vegetable oil, eggs, granulated sugar, brown sugar, and vanilla extract until smooth and uniformly blended. 
 04 -  Gradually fold the dry mixture into the wet mixture, stirring just until combined to avoid overmixing. 
 05 -  Gently fold in the white chocolate chips until evenly distributed. 
 06 -  Pour the batter into the prepared pan, smoothing the top with a spatula. 
 07 -  Bake for 22 to 27 minutes, or until a toothpick inserted into the center comes out mostly clean with a few moist crumbs. 
 08 -  Allow to cool fully in the pan on a wire rack. Use the parchment overhang to lift out, slice into bars, and serve.