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Preheat oven to 350 degrees. Line two large or three medium baking pans with parchment paper and set aside.
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Whisk all dry ingredients (flour, baking powder, gum, spices) and set aside.
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Using an electric mixer, beat butter with brown sugar until fluffy- about 2-3 minutes.
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Beat in egg and molasses, followed by oil. Turn mixer to low and gradually add in flour until fully incorporated. Stir in crystallized ginger, if using. Roll into a ball and place in fridge for at least 30 minutes before rolling.
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When refrigerated and firmer, roll dough into small 1” balls. Roll in granulated sugar before placing 3” apart on parchment-lined baking sheets.
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Bake 16-18 minutes, turning pan halfway. Cook on pan for a few minutes before transferring to a wire rack to cool completely.