INGREDIENTS
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1 stick (4 ounces) unsalted butter
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4 ounces good-quality unsweetened chocolate, coarsely chopped
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1 cup packed light brown sugar
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1/2 cup granulated sugar
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2 teaspoons pure vanilla extract
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2 large eggs
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1 cup all-purpose flour
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1/2 cup unsweetened cocoa powder
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1 tablespoon ground cinnamon
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1 teaspoon chili powder
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1/2 teaspoon baking soda
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1/2 teaspoon kosher salt
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1/4 teaspoon cayenne pepper
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1 cup semisweet chocolate chips