INGREDIENTS
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12 tablespoons (1 ½ 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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½ cup sour cream, at room temperature
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2 tablespoons brewed coffee
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1 ¾ cups all-purpose flour
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1 cup good cocoa powder
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1 ½ teaspoons baking soda
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½ teaspoon kosher salt
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Miniature Reese's Peanut Butter Cups, to decorate (optional)
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Kathleen’s Peanut Butter Icing
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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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¾ teaspoon pure vanilla extract
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¼ teaspoon kosher salt
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1/3 cup heavy cream