INGREDIENTS
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12 tablespoons (1 1/2 sticks) unsalted butter, at room temperature
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2/3 cup granulated sugar
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2/3 cup light brown sugar, packed
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2 extra-large eggs, at room temperature
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2 teaspoons pure vanilla extract
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1 cup buttermilk, shaken, at room temperature
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1/2 cup sour cream, at room temperature
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2 tablespoons brewed coffee
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1 3/4 cups all-purpose flour
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1 cup good cocoa powder
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1 1/2 teaspoons baking soda
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1/2 teaspoon kosher salt
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Kathleen's Peanut Butter Icing, recipe follows
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Chopped salted peanuts, to decorate, optional
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1 cup confectioners' sugar
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1 cup creamy peanut butter
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5 tablespoons unsalted butter, at room temperature
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3/4 teaspoon pure vanilla extract
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1/4 teaspoon kosher salt
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1/3 cup heavy cream
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