Preheat the oven to 350°F.
Beat the butter and sugar together with an electric mixer until light and fluffy, 2 to 3 minutes.
Add the egg and molasses and mix well.
In a separate bowl, stir together the flour, baking soda, salt, cinnamon, and ginger.
Add the dry ingredients to the wet and mix until well combined.
Scoop balls of dough slightly smaller than a golf ball. If you like, roll them in granulated sugar. Place them on a baking sheet 2 to 3 inches apart.
Bake for 8 to 9 minutes. Do not overcook! The centers should still look soft when they come out.
Let the cookies cool on the baking sheet for about 10 minutes, then transfer them to a wire rack to finish cooling.