INGREDIENTS
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3 ounces bittersweet chocolate, chopped
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½ cup butter
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1 cup light brown sugar
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1 teaspoon vanilla extract
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2 large eggs, beaten
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½ cup all-purpose flour
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¾ teaspoon baking powder
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¼ cup unsweetened cocoa (not Dutch-processed)
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½ teaspoon salt
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1 cup semisweet chocolate chips
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½ cup white chocolate chips
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½ cup chopped walnuts