I love Splenda and Cinnamon on top of mine!
Also, you can make yummy baked chips:
Beat together egg whites, splenda and cinnamon. Put in either a bowl or bag, mix/shake together with thin sliced sweet potatoes. Spray a metal rack with non-stick cooking spray and bake till kinda crunchy.
I always make these when I entertain. Good for a little carb/protein mix!