Using a stand mixer (or hand mixer + large bowl), cream together butter, sugar, and molasses on medium high speed until smooth, about 5-7 minutes.
1/2 cup unsalted butter, 1 cup granulated sugar, 1/4 cup molasses
Drop speed to low and add egg, mixing thoroughly until incorporated, about 1-2 minutes.
1 large egg
Keeping speed on low, quickly add dry ingredients to mixer, scooping in about 1/3 to 1/2 cup at a time. Stop mixing once dough looks smooth and uniform. Be careful not to overmix.
Turn off mixer and add crystalized ginger to bowl. Use a spoon or spatula to gently fold ginger into the dough.
1 tablespoon chopped crystallized ginger
Remove dough from bowl and place on a piece of plastic wrap. Firmly wrap dough and chill in the refrigerator for at least 1 hour.
Preheat oven to 350 degrees F. Line two baking sheets with parchment paper. Place powdered sugar in a shallow bowl and keep it handy for the next step.
Unwrap dough and use your fingers to pinch off 1-2 tablespoons, then roll dough into a ball. Drop ball in powdered sugar and toss to coat completely. Place sugar coated cookie ball on the prepared baking sheet. Repeat this step until all the cookie dough batter is used, spacing cookies 2 inches apart.
1/3 cup powdered sugar
Bake cookies for 10-13 minutes or until tops of cookies are lined with cracks (as pictured). If baking two cookie sheets at once, rotate baking sheets halfway through cooking time.
Let cookies cool on the baking sheet for 5 minutes before transferring to a wire cooling rack to cool completely.