In a medium bowl, combine milk, cocoa, coffee and cornstarch and mix well.
In a small non-stick saucepan, over medium-low heat, evenly spray cooking oil for 2 seconds, add milk mixture and cook slowly. Continue to stir while the mixture cooks and becomes creamy. Remove from heat and set aside to cool completely.
Pour creamy milk mixture into a mixing bowl and whip with a hand mixer or blender; remove all lumps. Add the strawberry preserves and whip again; add whipped topping and coffee essence and whip until smooth.
Gently fold in diced banana and garnish with a strawberry slice.
Serving Size 1 (66g)
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.