– ½ cup (113 g) unsalted butter – 1 15.25 oz. boxed red velvet cake mix – 1 teaspoon cornstarch – ½ teaspoon salt – ¼ cup (50 g) granulated sugar – 2 large eggs, room temperature – 1 teaspoon (5 ml) vanilla extract – 1 cup (170 g, 6 oz.) white chocolate chip
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