Cook the Pasta: Bring a large pot of salted water to a boil, add pasta, and cook until al dente, about 8-10 minutes. Drain and rinse under cold water.

Prepare the Vegetables: In a large bowl, combine cooled pasta, cherry tomatoes, cucumber, red onion, and green bell pepper.

Add Olives and Cheese: Incorporate sliced black olives, parsley, and mozzarella cheese. Gently fold to combine.

Mix the Dressing: In a separate bowl, whisk together Italian dressing, mayonnaise, vinegar, sugar, salt, and pepper until smooth.

Combine and Chill: Pour dressing over pasta mixture and fold gently to coat. Cover and refrigerate for at least 1 hour.

Serve and Toss: Before serving, gently toss the salad to redistribute dressing and enjoy!