INGREDIENTS
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1 cup (1/2 lb.) butter, at room temperature
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1/4 cup firmly packed brown sugar
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1/2 cup granulated sugar
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2 large egg yolks
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1 teaspoon vanilla
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2 cups all-purpose flour
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1/2 teaspoon baking powder
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1/4 teaspoon salt
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About 1/3 cup turbinado sugar (see notes)
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Chocolate ganache (recipe follows)