In a medium non-stick saucepan, over low medium heat, add oats and milk. Stir occasionally and cook for 5-6 minutes until thickened. Let mixture cool completely.
Using a hand-held mixer or a blender, blend oats and milk mixture to make a fine puree; add mashed bananas and puree; add whipped topping and fold gently with a spoon; cover and refrigerate mousse for 1 to 2 hours.
In a small microwave-safe bowl, add 5 whole blueberries, blueberry preserves and water; heat on high for 30 seconds; remove and smash with a fork to make a thick sauce.
Garnish mousse with sliced bananas, blueberry sauce and fresh blueberries.
Serving Size 121g
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.