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Sift the dry ingredients together. Beat the butter and brown sugar with molasses until well combined and fluffy. Add the egg and ginger and beat 3 minutes. Add the flour mixture with the machine on low and then stir in the candied ginger by hand, do not over mix. Chill until the dough is firm and no longer sticky, at least 1 hour or overnight.
Preheat the oven to 350 degrees F. Scoop with small ice cream scoop, about 1 tablespoon, and roll into a ball and then roll in granulated sugar. Place on parchment-lined baking sheets, about 2 inches apart and press flat, 1/4-inch high.
Bake about 16 minutes or until the edges are firm and the tops feel set to the touch. Cool 1 minute on the baking sheets and then carefully transfer to a wire rack to cool completely.