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Stir flour, cinnamon, ginger, baking soda, and salt together in a small bowl; set aside.
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Cream butter and brown sugar with a mixer until smooth.
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Beat in egg and vanilla.
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Mix in flour mixture JUST until blended. Do not overmix or cookies could become tough.
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FOLD in butterscotch chips, shape into a wedge, cover and wrap tightly with plastic wrap, and CHILL dough until firm, a minimum of 1 hour.
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Preheat oven to 350 degrees.
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Line 2 baking sheets with parchment paper.
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Sift powdered sugar.
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Shape dough into 1 1/2 inch balls, roll balls of dough in powdered sugar, and arrange on prepared baking sheets, spacing 3 inches apart.
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Bake 12 to 15 minutes, or until golden and just set.
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Let cookies COOL on the pan for 5 minutes, then transfer to a rack.