Spray a large mug (or two small mugs) with non-stick cooking spray. In a small bowl, mix together oat flour, rolled oats, cinnamon, baking powder, salt, and stevia. Add in mashed banana and yogurt to form dough. In a separate bowl, mash the date and add in cinnamon and salt (you can also do this in a food processor and add in a bit of water for a thinner textured filling if desired).
Place ½ of dough into the mug. Pour ¾ of date filling on top and then add remaining dough. Cover with the remaining filling. Microwave on high for 60-90 seconds or until cooked throughout.
While mug cake is baking, mix together cream cheese, Greek yogurt, vanilla, and stevia in a small bowl or food processor. Top cinnamon roll with icing when warm. Remaining icing can be stored in the fridge for up to 3 days.
Nutrition Facts (per serving): 186 Calories 32 gm Carbs, 3 gm Fiber, 8gm Protein, 2 gm Fat