INGREDIENTS
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3 tablespoons unsalted butter
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1 cup all-purpose flour
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¾ cup sugar
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¾ teaspoon baking powder
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¼ teaspoon baking soda
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½ teaspoon Kosher salt
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½ teaspoon cinnamon
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1 large egg
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½ cup plus 2 tablespoons buttermilk
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1 teaspoon vanilla extract
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½ cup sugar
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½ cup brown sugar
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1 tablespoon cinnamon
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3 tablespoons unsalted butter