Boil a large pot of salted water over high heat. Add pasta and cook according to package instructions until al dente, typically 8-10 minutes. Drain and rinse under cold water.

Dice the bell peppers and red onion, and slice the olives. Set aside in a mixing bowl.

In a separate bowl, mix olive oil, Italian seasoning, and grated Parmesan cheese until smooth.

In a large mixing bowl, combine cooled pasta and prepared vegetables. Pour the dressing over and toss gently.

Serve immediately or chill in the refrigerator for about 30 minutes before serving.