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.
Nutrition Facts: Serving Size: 1 serving (121g), Servings: 4, Amount Per Serving: Calories 140, Fat Calories 10, Total Fat 1g (2% DV), Sat. Fat 0g (0% DV), Trans Fat 0g, Sodium 35mg (1% DV), Total Carbohydrates 28g (9% DV), Fiber 3g (12% DV), Sugars 13g, Protein 5g, Vitamin A (4% DV), Vitamin C (10% DV), Calcium (8% DV), Iron (4% DV). Percent Daily Values (DV) are based on a 2,000 calorie diet.