INGREDIENTS
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1 ¼ cups unsweetened cocoa powder
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2 ½ cups all purpose flour
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2 ½ cups sugar
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2 ½ teaspoons baking soda
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1 ¼ teaspoons baking powder
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1 ¼ teaspoons salt
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2 large eggs plus 1 large egg yolk
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1 ¼ cups warm water
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1 ¼ cups buttermilk
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½ cup plus 2 tablespoons vegetable oil
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1 ½ teaspoons pure vanilla extract