INGREDIENTS
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5 egg whites, room temperature
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3/4 cup buttermilk, divided
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3/4 cup unsalted butter, softened
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1 3/4 cups granulated sugar
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2 1/2 cups cake flour
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1 Tbsp baking powder
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1/2 tsp kosher salt
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1 1/2 tsp cinnamon
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1 tsp nutmeg
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1 tsp ground ginger
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1 cup unsalted butter, softened
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4 cups powdered sugar
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1 tsp cinnamon
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1/4 cup milk
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1/2 cup cinnamon chips