Bring a large pot of salted water to a boil. Add pasta and cook until al dente. Drain and rinse with cold water to stop the cooking process.

While the pasta cools, prepare your vegetables: halve the cherry tomatoes, dice the bell peppers, thinly slice the onion, and slice the olives.

In a small bowl, combine olive oil, red vinegar, Italian seasoning, salt, and pepper. Whisk until well blended.

In a large mixing bowl, combine the pasta, vegetables, mozzarella, and basil. Pour the dressing over the top and toss until everything is evenly coated.

Cover and refrigerate for at least 30 minutes before serving to allow the flavors to mingle.