Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a bowl, cream together the softened butter and sugar until light and fluffy.
Add the egg and grated ginger, and mix until well combined.
In another bowl, combine the flour, baking soda, and salt. Gradually add this to the wet mixture, mixing until just combined.
Fold in the white chocolate chips.
Drop spoonfuls of the dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake for 10-12 minutes or until the edges are lightly golden. Allow cookies to cool on the baking sheet for a few minutes before transferring to a wire rack.