01 - Place softened cream cheese in a large mixing bowl. Beat using an electric mixer until completely smooth and creamy, with no lumps remaining.
02 - Pour in powdered sugar and vanilla extract. Continue beating until fully incorporated and the mixture becomes light and fluffy.
03 - In a separate chilled bowl, whip cold heavy cream with electric beaters until stiff peaks form. The cream should hold its shape when beaters are lifted.
04 - Gently fold whipped cream into cream cheese mixture using a rubber spatula. Use light, sweeping motions until smooth and uniform, avoiding deflating the whipped cream.
05 - Add quartered strawberries, blueberries, and mini marshmallows to cream mixture. Fold gently to combine until fruits and marshmallows are evenly distributed throughout.
06 - Cover bowl and refrigerate for at least 1 hour to allow flavors to meld and achieve optimal creamy texture.
07 - Serve chilled in individual bowls. Optionally garnish with additional fresh berries for presentation.