Heat oven to 180 deg C. Line a baking tray with butter paper, set aside.
In a mixing bowl using a cake beater mix together butter and sugar on medium high speed until light and fluffy about 5 minutes.
Add egg, mix at high speed to combine. Now add the zest and mix well.
In another bowl whisk together flour, ginger powder, baking soda, salt, and crystallized ginger.
Add to butter mixture, mix on medium low speed to combine for about 20 seconds.
Using two spoons, drop about 2 teaspoon batter on the baking sheet, repeat spacing them 3 inches apart.
Sprinkle cookies with more sugar and bake until just golden about 7 -10 minutes.
Slide butter paper onto a wire rack, let cool for 15 min. Store in airtight container.