Place butter in a mug and melt in microwave. Meanwhile, in a small bowl whisk together cake mix and cinnamon then whisk in milk and stir until well blended. Pour mixture over melted butter in mug . Drain 2 Tbsp liquid from peaches then pour peaches over top of cake mix . Microwave on 50% power for about 3 - 4 minutes, until desired doneness . Allow to cool slightly then optionally top with vanilla ice cream and a light dusting of cinnamon.
