01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together flour, ground ginger, cinnamon, cloves, nutmeg, baking powder, baking soda, and salt until well combined.
03 - In a separate bowl, whisk granulated sugar, light brown sugar, melted butter, eggs, molasses, and vanilla extract until smooth.
04 - Add wet mixture to dry ingredients and stir until a sticky dough forms.
05 - Divide dough in half. Shape each half into a log approximately 10 inches long and 2 inches wide on the prepared baking sheet. Flatten slightly.
06 - Bake logs for 25 minutes, until puffed and set. Remove from oven and cool for 10 minutes.
07 - Reduce oven temperature to 300°F.
08 - Using a serrated knife, slice each log diagonally into 1/2-inch thick pieces. Place slices cut side down on the baking sheet.
09 - Bake slices for 12 minutes, flip, then bake for an additional 10 to 12 minutes until crisp and golden. Cool completely on a wire rack.
10 - Melt white chocolate in a heatproof bowl over simmering water or in the microwave in short bursts, stirring until smooth.
11 - Dip one end of each cooled biscotti into melted white chocolate, allowing excess to drip off. Place on parchment paper until chocolate sets.