Lowest calorie fast food

Sweet potato brownies!! 130kcals each... so good!! 

Recipe was made it up and...it was approx... 600g sweet potato.. baked... mashed... 150g oats... ground.... 1 tsp BP 1 tsp vanilla 0.5 cup decaff coffee... 3tbsp cocoa... 1 cup oat milk... pinch salt...some sweetener to taste.......mix... bake... in a lined brownie pan... I didn't time it... maybe 20 mins @200c?. The icing is 1 tbsp cocoa... 2 tbsp pb powder water and sweetener.