CAKE: Put all cake ingredients in a large bowl and mix together until blended. Pour into 9×13 pan lined with aluminum foil (it will help you take the cake out of the pan easier after baking).
CINNAMON TOPPING: Mix all the topping ingredients and drop with a spoon evenly over the batter. Use skewer or a knife to make swirls.
Bake Sweet Potato Cinnamon Roll Cakeat 350 F (175 C) for 30-35 minutes or until a toothpick inserted in center of the cake comes out clean.