"Soft and chewy chocolate chip cookie bars..."
INGREDIENTS
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1 cup unsalted butter (melted and then cooled for at least 5 minutes (226g))
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1 cup light brown sugar ( tightly packed (200g))
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3/4 cup sugar ((150g))
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2 large eggs + 1 egg yolk (room temperature preferred)
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1 1/2 teaspoons vanilla extract
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2 1/2 cups all-purpose flour ((285g))
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2 teaspoons cornstarch ((cornflour in the UK))
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1 /2 teaspoon baking powder
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1 teaspoon salt
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2 cups semisweet chocolate chips ((340g))