Add the butter, brown sugar and molasses to a bowl and, using an electric handheld mixer, blend them well until creamy.
Add in the egg and mix well.
In a separate bowl, add the flour, baking soda, ginger, cinnamon, nutmeg, and cardamom together with a spoon.
Then, add the dry ingredients to the wet ones and mix just until all ingredients are incorporated.
Toss in the candied ginger - reserving just a few to dot the tops of the cookies with. If not using candied ginger, you can dust your cookies with a mixture of granulated sugar and a pinch of ginger and cinnamon. Chill dough for 1 hour at least or overnight.
Then, Preheat the oven to 375 degrees F
Scoop spoonfuls of cold dough, roll into rough balls and bake at 375 degrees for 10-12 minutes.
Let cool and enjoy.