To create this Mediterranean Chicken Pasta Salad, simply follow these easy steps:

1. Cook the Pasta: In a large pot of boiling salted water, cook the pasta according to the package instructions until al dente. Drain and rinse under cold water to stop the cooking process. Set aside.

2. Prepare the Vegetables: While the pasta cooks, chop the cherry tomatoes, cucumber, bell pepper, and red onion. Slice the olives and crumble the feta cheese if using. Place all the chopped ingredients in a large mixing bowl.

3. Add the Chicken: Once the pasta has cooled, add the diced cooked chicken to the bowl with the vegetables.

4. Mix the Dressing: In a small bowl, whisk together the olive oil, lemon juice, lemon zest, dried oregano, salt, and pepper. Adjust seasoning as needed.

5. Combine Ingredients: Pour the dressing over the pasta salad and toss gently to combine everything evenly.

6. Add Fresh Herbs: Fold in the fresh parsley and mix again.

7. Chill: Cover the salad and place it in the refrigerator for at least 30 minutes. This allows the flavors to meld beautifully.

8. Serve: Once chilled, give the salad a quick toss and adjust the seasoning if necessary. Serve as a main dish or a side.