01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - Whisk together flour, ginger, cinnamon, nutmeg, cloves, baking powder, and salt in a medium bowl.
03 - Cream brown sugar and butter in a large bowl until light and fluffy. Incorporate eggs one at a time, mixing thoroughly after each addition. Blend in molasses and vanilla extract until uniform.
04 - Gradually add the dry mixture to the wet ingredients, stirring until a soft dough develops.
05 - Divide dough in half. Shape each portion into a 12-inch long by 2-inch wide log. Arrange logs on prepared baking sheet with ample space between.
06 - Bake for 25 minutes, or until logs are firm and cracked on top. Remove from oven, let cool for 10 minutes.
07 - Reduce oven temperature to 300°F. Using a serrated knife, slice each log diagonally into 1/2-inch thick pieces. Lay biscotti slices cut side down on the baking sheet.
08 - Bake for 10 minutes, flip biscotti, and bake an additional 10 minutes, until crisp and golden. Cool completely on a wire rack.
09 - Melt dark chocolate either in a heatproof bowl over simmering water or in the microwave in short intervals, stirring until smooth.
10 - Dip one end of each cooled biscotti into the chocolate, allowing excess to drip off. Place dipped biscotti on parchment paper and let chocolate set entirely before serving or storing.