INGREDIENTS
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2 sticks plus 5 tablespoons (10.5 ounces) salted butter
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1 cup water
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10.5 ounces white chocolate, chopped or broken
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3 2/3 cups (450g) all-purpose flour
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2 cups (400g) superfine sugar
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3 1/2 teaspoons baking powder
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4 extra large eggs, lightly beaten (room temperature is best)
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2 tablespoons plus 1 teaspoon vegetable oil
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2 teaspoons vanilla extract (or the seeds from 1 vanilla bean pod)