Cook the pasta according to the package instructions. Drain and let it cool completely.

In a large serving bowl, combine the cooled pasta, halved cherry tomatoes, and mozzarella balls. Gently fold in the chopped basil.

In a small bowl, whisk together the mayonnaise, sour cream, balsamic vinegar, salt, and pepper until smooth.

Pour the dressing over the pasta mixture and toss gently to ensure everything is well-coated.

Place the salad in the refrigerator and chill for at least 30 minutes before serving.