INGREDIENTS
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2/3 cup (2 ounces) Dutch-process cocoa
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2 cups (8 1/2 ounces) King Arthur Unbleached All-Purpose Flour
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1 1/4 cups (9 3/8 ounces) light brown sugar
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1 teaspoon baking powder
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3/4 teaspoon espresso powder, optional
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1 teaspoon baking soda
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3/4 teaspoon salt
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1 cup (6 ounces) chocolate chips
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2 large eggs
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3/4 cup (6 ounces) milk
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2 teaspoons vanilla
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2 teaspoons vinegar
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1/2 cup (4 ounces, 1 stick) butter, melted; or 1/3 cup (2 3/8 ounces) vegetable oil
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coarse white or pearl sugar, for topping (optional)