– 1 ¼ cup all purpose flour – 1 teaspoon ground cinnamon – ½ teaspoon baking powder – ¼ teaspoon baking soda – ⅓ cup brown sugar – ¼ teaspoon kosher salt – 1 egg – 1 cup + 2 tablespoons buttermilk, divided – ½ teaspoon vanilla extract – 2 Granny Smith apple – 1 cup powdered sugar
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