INGREDIENTS
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3.38 ounces all-purpose flour (about 3/4 cup)
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1 cup granulated sugar
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3/4 cup unsweetened cocoa
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1/2 cup packed brown sugar
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1/2 teaspoon baking powder
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1/4 teaspoon salt
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1 cup bittersweet chocolate chunks, divided
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1/3 cup fat-free milk
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6 tablespoons butter, melted
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1 teaspoon vanilla extract
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2 large eggs, lightly beaten
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1/2 cup chopped walnuts, divided
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Cooking spray