"They have the perfect chewy interior and caramel-crisp edges...."
INGREDIENTS
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8 tablespoons (1 stick) unsalted butter
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1 3/4 cups all-purpose flour
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1 tablespoon instant espresso powder
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3/4 teaspoon kosher salt
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1/2 teaspoon baking powder
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1/2 teaspoon baking soda
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4 ounces semi-sweet or bittersweet chocolate feves or bars
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3/4 cup packed dark brown sugar
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1/4 cup granulated sugar
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1 large egg
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1 teaspoon vanilla extract
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Flaky salt, for topping (optional)