Combine sugar, butter, orange zest, orange juice and brandy in a large bowl, stirring until smooth.

Whisk in the eggs one at a time and then stir in flour, baking powder and salt. Mix in the cranberries, cover dough and chill for 30 minutes.

Preheat oven to 350°F and line a baking sheet with parchment paper. Using moistened hands, shape dough into 2 (10 x 4 inch) loaves on prepared baking sheet. Bake for 22 minutes or golden. Transfer loaves to a wire rack and cool for 15 minutes.

Cut loaves into 1/2 inch slices. Place slices cut side down on baking sheet; bake 7 to 9 minutes. Turn slices over and bake for 7 to 9 minutes more or until golden. Cool.

Line a baking sheet with parchment paper. Melt chocolate in the microwave, stirring occasionally until smooth. Use a fork to drizzle chocolate over the biscotti.