INGREDIENTS
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1/2 cup unsalted butter (1 stick) cut into 4 pieces
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2 ounces bittersweet chocolate, chopped
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1/2 cup (1.5 ounces) Dutch-processed cocoa powder
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3/4 cup (3.75 ounces) all-purpose flour
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1/2 teaspoon baking soda
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3/4 teaspoon baking powder
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2 eggs
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3/4 cup (5.25 ounces) granulated sugar
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1 teaspoon vanilla extract
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1/2 teaspoon salt
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1/2 cup (4 ounces) sour cream
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1 cup powdered sugar
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1 cup creamy peanut butter
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5 tablespoons unsalted butter, softened
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3/4 teaspoon vanilla extract
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1/4 teaspoon salt
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1/3 cup heavy cream