INGREDIENTS
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1 3/4 cups King Arthur Gluten-Free Flour
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1/2 cup sugar
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1/2 teaspoon salt
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2 teaspoons baking powder
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1 teaspoon xanthan gum
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2 tablespoons whole flax meal
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1 tablespoon cinnamon
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1/2 cup (8 tablespoons) unsalted butter, softened
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3 large eggs
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1 tablespoon boiled cider or apple juice
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2 cups peeled, cored, coarsely grated apple
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1/2 cup confectioners' sugar
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1 to 2 tablespoons heavy cream or milk
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1/2 teaspoon vanilla extract