Gluten-Free Biscuits
Ingredients:
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1 ½ cups sorghum flour
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1 cup millet flour
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½ cup tapioca starch
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4 teaspoons baking powder
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2 teaspoons xanthan gum
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1 ½ teaspoons baking soda
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1 ½ teaspoons salt
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½ cup cold butter
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1 cup milk
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1 egg, beaten
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1 tablespoon cider vinegar
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2 tablespoons rice flour, or as needed