Combine cinnamon and sweetener in a small bowl, until evenly mixed. Then, sprinkle over the peaches.
Broil close to the heating element on high in your oven or toaster oven. Watch carefully and remove when peaches start bubbling, about 6-10 minutes.
Remove from oven.
If desired, serve with 1 Tbsp yogurt on each peach half and sprinkle with more cinnamon.