In a large mixing bowl, combine Greek yogurt, shredded cucumber, lemon juice, fresh dill, garlic powder, salt, and pepper. Stir gently until smooth and well-blended.

Add shredded cooked chicken, finely chopped red onion, pitted and sliced Kalamata olives, crumbled feta cheese, and chopped fresh parsley to the tzatziki mixture. Use a spatula to gently fold everything together.

Before serving, taste the salad and adjust seasoning as needed with extra lemon juice, salt, or pepper.

For best results, cover the salad and chill in the refrigerator for about 30 minutes to enhance the flavors.

Once chilled, give the salad a gentle stir, transfer it to a serving bowl, and garnish with additional crumbled feta, dill, or olive oil.