01 - Preheat oven to 350°F. Line a baking sheet with parchment paper.
02 - Whisk together flour, ground ginger, cinnamon, cloves, nutmeg, baking powder, baking soda, and salt in a large bowl.
03 - In a separate bowl, whisk granulated sugar, brown sugar, melted butter, eggs, molasses, and vanilla extract until smooth.
04 - Stir wet mixture into dry ingredients until a sticky dough forms.
05 - Divide dough in half. Shape each half into a 10-inch long, 2-inch wide log on the prepared baking sheet, flattening slightly.
06 - Bake logs at 350°F 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, cut logs diagonally into 1/2-inch thick slices. Arrange slices cut side down on the baking sheet.
09 - Bake slices for 12 minutes, turn over, then bake another 10 to 12 minutes until crisp and golden. Cool fully on a wire rack.
10 - Melt white chocolate in a heatproof bowl over simmering water or in short microwave intervals, stirring until smooth.
11 - Dip one end of each cooled biscotti into melted white chocolate. Allow excess to drip off and rest on parchment until set.