1. 1. Prepare the Cream Cheese: Ensure cream cheese is softened. In a large mixing bowl, beat cream cheese and optional granulated sugar with an electric mixer until smooth and creamy, about 1-2 minutes.

2. 2. Whisk the Pudding: In a separate medium bowl, combine instant vanilla pudding mix with milk. Whisk vigorously for about 2 minutes until thickened.

3. 3. Combine Wet Ingredients: Add thickened pudding to the cream cheese mixture. Beat on low speed or whisk until just combined and smooth.

4. 4. Fold in Whipped Topping: Gently fold in thawed whipped topping using a rubber spatula, moving from bottom upwards until no streaks remain.

5. 5. Add Blueberries and Marshmallows: Fold in rinsed and dried fresh blueberries and mini marshmallows until evenly distributed.

6. 6. Chill Thoroughly: Transfer to a serving bowl or airtight container. Cover and refrigerate for at least 2-4 hours (overnight is best).

7. 7. Serve and Enjoy: Give a gentle stir if desired. Serve cold. Garnish with extra blueberries or mint if desired.