01 - Place softened cream cheese in a large mixing bowl. Beat until completely smooth and creamy, ensuring no lumps remain.
02 - Pour in powdered sugar and vanilla extract. Continue beating until fully incorporated and mixture becomes light and fluffy.
03 - In a separate chilled bowl, whip cold heavy cream using electric mixer until stiff peaks form. Do not overwhip.
04 - Gently fold whipped cream into cream cheese mixture using rubber spatula. Fold until smooth and uniform, maintaining airy texture.
05 - Add strawberries, blueberries, and mini marshmallows. Gently fold together until all ingredients are evenly distributed and coated with creamy mixture.
06 - Refrigerate salad for at least 1 hour to allow flavors to meld and mixture to set properly. Cover tightly to prevent absorption of other food odors.
07 - Serve chilled in individual bowls or a large serving dish. Optionally garnish with additional fresh berries for presentation.