INGREDIENTS
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1 1/4 cups cake flour
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1/2 cup unsweetened Dutch- process cocoa powder
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1 teaspoon baking soda
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1/4 teaspoon baking powder
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1/2 teaspoon salt
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1/2 cup (1 stick) plus 2 tablespoons unsalted butter, at room temperature
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1 1/2 cups granulated sugar
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3 large eggs
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1/2 cup buttermilk
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1 teaspoon vanilla extract
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1/2 cup hot strong coffee
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1/2 cup (1 stick) unsalted butter, at room temperature
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1 cup creamy peanut butter
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1 1/4 cups sifted confectioners' sugar
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4 ounces semisweet chocolate, roughly chopped
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1/2 cup heavy cream
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1 cup roasted peanuts, chopped