INGREDIENTS
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1 cup all-purpose flour
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3/4 cup granulated sugar
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1/4 cup plus 2 tablespoons unsweetened cocoa, divided
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2 teaspoons baking powder
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1/2 teaspoon salt
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1/2 cup milk
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2 tablespoons vegetable oil
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1 teaspoon vanilla extract
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3/4 cup chopped walnuts
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3/4 cup packed dark or light brown sugar
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1 3/4 cups hot water
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1 quart vanilla ice cream