Cook the whole wheat pasta according to package instructions until al dente. Drain and rinse under cold water to cool. Set aside.
In a large mixing bowl, combine the cooked pasta, diced chicken, cherry tomatoes, cucumber, red bell pepper, red onion, and parsley.
In a small bowl, whisk together the olive oil, red wine vinegar, garlic powder, dried oregano, salt, and pepper until well combined.
Pour the dressing over the pasta salad and toss gently to combine all ingredients evenly.
If using, sprinkle the feta cheese on top and give it a light toss.
Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld before serving.