Beat butter and sugars together until light and fluffy. Stir in egg, molasses and ginger until evenly blended. In a separate bowl, stir dry ingredients together. Add to butter mixture and stir to incorporate. Stir in candied ginger. Cover bowl and chill dough
for 2 hours.
Preheat oven to 350 °F and line a baking tray with parchment paper. Shape dough into 1-inch balls and roll in sugar. Press down on baking tray, 3-inches apart. Bake for 12 to 15 minutes and cool completely on baking tray before removing.