INGREDIENTS
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2 sticks (1 cup) unsalted butter, at room temperature
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1 cup sugar
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¼ cup light brown sugar
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1 egg
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1 teaspoon pure vanilla extract
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2½ cups all-purpose flour
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½ teaspoon salt
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1 teaspoon baking soda
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½ teaspoon baking powder
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¼ cup cocoa powder
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⅓cup mini white chocolate chips (optional)
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⅓cup mini semisweet chocolate chips (optional)