Preheat oven to 180 degree C.
Take butter, brown sugar, egg in a bowl and whisk well.
Add in baking soda, ginger and mix well.
Add flour and ginger and mix well.
Shape it into a dough.
Take small portion of dough, roll it.
Arrange it in a parchment lined baking pan. Flatten it lightly.
Bake for 15 mins.
Remove the tray from oven, cool it.