01 -  Preheat oven to 350°F. Line a baking sheet with parchment paper. 
 02 -  In a large mixing bowl, whisk together the flour, baking powder, baking soda, cinnamon, nutmeg, ginger, cloves, and salt until evenly blended. 
 03 -  In a separate bowl, whisk together granulated sugar, brown sugar, pumpkin purée, eggs, vegetable oil, and vanilla extract until smooth. 
 04 -  Add the wet ingredients to the dry ingredients and stir gently until just combined, taking care not to overmix. 
 05 -  Fold in chopped nuts and mini chocolate chips, if using. 
 06 -  Divide the dough in half. Shape each portion into a log approximately 10 inches long and 2 inches wide. Place logs on the prepared baking sheet, spaced apart, and flatten tops slightly. 
 07 -  Bake for 25 minutes or until the logs are set and lightly golden. Remove from oven and let cool on the pan for 10 minutes. 
 08 -  Lower oven temperature to 300°F. 
 09 -  Using a serrated knife, slice each log diagonally into dippers about 1/2 inch thick. Arrange slices cut side down on the baking sheet. 
 10 -  Bake for 10 minutes, flip each piece, and continue baking for another 10–12 minutes, until biscotti are crisp and golden. 
 11 -  Transfer biscotti to a wire rack to cool completely before serving or storing.