INGREDIENTS
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8 tablespoons (1 stick) unsalted butter, cut into small pieces, plus more for pan
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2 ounces good-quality unsweetened chocolate, coarsely chopped
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4 ounces good-quality semisweet chocolate, coarsely chopped
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2/3 cup all-purpose flour
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1/2 teaspoon baking powder
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1/4 teaspoon salt
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3/4 cup granulated sugar
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3 large eggs
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2 teaspoons pure vanilla extract
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4 tablespoons unsalted butter, melted
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1/2 cup confectioners' sugar
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3/4 cup smooth peanut butter
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1/4 teaspoon salt
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1/2 teaspoon pure vanilla extract