Mix flour, ground ginger, cinnamon, baking powder, and salt in a small mixing bowl.
Cream butter and brown sugar together in a medium bowl, mixing well. Add the egg, grated ginger and molasses, and mix until blended. Add in the flour mixture.
Cover bowl with plastic wrap and chill for 15 min.
Roll into 1 1/4-inch balls and place 2 inches apart on prepared cookie sheets. Bake just until puffed and golden - anywhere from 15-20 min.Cool on a wire rack.
Notes
If you like roll balls in sugar before placing on the baking sheet. I skipped this step.