Cook pasta according to package directions, drain and rinse with cold water until completely cool

In a large bowl, whisk together olive oil, red wine vinegar, oregano, salt and pepper

Add cooled pasta, feta cheese, olives, tomatoes, cucumber, and red onion to the bowl

Toss everything together until well coated with dressing

Sprinkle with fresh parsley and let sit for 10 minutes before serving

Adjust seasoning if needed and serve chilled or at room temperature