INGREDIENTS
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1⁄2 cup unsalted butter, at room temperature
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1⁄2 cup granulated sugar
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1⁄2 cup brown sugar
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1 large egg
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1 tsp pure vanilla extract
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1 1⁄2 cup all-purpose flour
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1⁄4 cup unsweetened cocoa powder
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1⁄2 tsp baking soda
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1⁄2 tsp baking powder
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1⁄2 tsp salt
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1⁄2 cup milk chocolate chips
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1⁄2 cup semi-sweet chocolate chips