INGREDIENTS
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1 cup cornstarch
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1 cup brown rice flour
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1 tsp. xanthan gum
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4 tsp. baking powder
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1/2 tsp. baking soda
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1 tsp. kosher salt
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4 Tbsp. butter, unsalted, chilled, cut into small cubes
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1 cup buttermilk
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2 egg whites
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cooking spray