INGREDIENTS
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2 1/2 cups all-purpose flour
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1 1/4 cups dutch-process cocoa powder
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2 1/2 cups sugar
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2 1/2 tsp baking soda
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1 1/4 tsp baking powder
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1 1/4 tsp salt
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2 large eggs, plus 1 large egg yolk
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1 1/4 cups whole milk
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1/2 cup vegetable oil, plus 2 tablespoons
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1 1/4 tsp pure vanilla extract
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1 1/4 cups warm water