
Preheat the oven to 325˚F. Line a large baking sheet with parchment paper.
In a large bowl, whisk the sugar, 2 whole eggs, and orange zest together by hand until the mixture turns pale yellow, about 2 minutes. Mix in the ginger and vanilla extract until combined. In a separate medium bowl, sift the flour, baking powder, and salt together. Add the flour mixture and cranberries to the egg mixture and stir with a wooden spoon until everything has been incorporated.
Lightly flour the prepared baking sheet and transfer the dough onto the baking sheet. The dough will be sticky; this is how you get the signature crunchy texture. Sprinkle a little flour on top of the dough, then form it into an even rectangle about 4 inches wide and 14 inches long, adding more flour as needed while you shape it.
Lightly beat the remaining egg white, then brush it on the exposed surfaces of the dough. Sprinkle with granulated sugar and bake for 30 minutes.
Remove from the oven and carefully slide the parchment onto a cutting board. Using a serrated knife, cut the dough into 1-inch thick slices. Spread the slices out onto the baking sheet and bake again for 10 minutes, turning the cookies over halfway through baking time. Let cool completely and enjoy.