Soften cream cheese at room temperature completely.
Mix cream cheese, mayonnaise, and sour cream together.
Dice tomatoes into small, uniform pieces carefully.
Drain excess liquid from diced tomatoes thoroughly.
Mince garlic cloves using sharp knife precisely.
Chop fresh basil leaves into small pieces.
Combine tomatoes, garlic, and basil in bowl.
Add Parmesan cheese to tomato mixture evenly.
Pour balsamic vinegar over vegetable mixture slowly.
Season with Italian seasoning, salt, and pepper.
Fold vegetable mixture into cream cheese base.
Refrigerate for 30 minutes before serving immediately.