INGREDIENTS
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For the Brownies
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1 cup granulated sugar
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1/2 cup all-purpose flour
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1/3 cup dark cocoa powder
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1/4 teaspoon salt
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1/4 teaspoon baking powder
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2 eggs, at room temperature
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1/2 cup (1 stick) unsalted butter, melted
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1/2 teaspoon vanilla extract
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1 cup chocolate chunks
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For the Peanut Butter Frosting
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6 tablespoons unsalted butter, softened
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3/4 cup creamy peanut butter
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1 cup confectioners' sugar
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1 dark chocolate bar (for grating over top, optional)