INGREDIENTS
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1 stick unsalted butter, at room temperature
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1 1/4 cups granulated sugar
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1 large egg
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1 cup buttermilk, at room temperature
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1 teaspoon pure vanilla extract
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1 3/4 cups all-purpose flour
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3/4 cup unsweetened cocoa powder
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1 1/2 teaspoons baking soda
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1/2 teaspoon baking powder
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Pinch of kosher salt
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4 ounces cream cheese, at room temperature
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4 tablespoons unsalted butter, at room temperature
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2/3 cup confectioners' sugar
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1/4 cup canned pure pumpkin
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1/4 teaspoon ground cinnamon
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Pinch of kosher salt