INGREDIENTS
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2 (12-ounce) bottles of Guinness extra stout
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1/2 cup packed light brown sugar
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2 3/4 cup unbleached all-purpose flour
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1/3 cup unsweetened cocoa powder
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1 teaspoon espresso powder
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1 teaspoon baking powder
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1 teaspoon baking soda
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1 teaspoon kosher salt
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1 cup (8 ounces) unsalted butter, at room temperature
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1 cup granulated sugar
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1/2 cup packed light brown sugar
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2 extra large eggs
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1 extra large egg yolk
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1 Tablespoon pure vanilla extract
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2 cups white chocolate chips
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1 cup milk chocolate chips