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Combine flour and next 3 ingredients (through salt), stirring well with a whisk.
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Place butter and brown sugar in a medium bowl; beat with a mixer at medium speed until light and fluffy (about 1 minute).
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Gradually add flour mixture, beating at low speed. (Mixture will appear crumbly.)
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Sprinkle ice water over flour mixture; beat at low speed just until combined.
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Shape the dough into 2 (6-inch-long) logs; wrap each log in plastic wrap.
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Chill 1 hour or until very firm.
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Preheat oven to 350°.
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Line baking sheets with parchment paper.
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Unwrap dough; cut each log into 16 slices using a serrated knife.
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Place dough circles 1 inch apart on prepared baking sheets.
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Sprinkle tops evenly with turbinado sugar, gently pressing into dough.
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Bake for 18 minutes or until lightly browned.
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Remove from baking sheets; cool on a wire rack.