In a large mixing bowl, combine Greek yogurt, shredded cucumber, lemon juice, dill, garlic powder, salt, and pepper. Mix until smooth to create the tzatziki base.

Fold in shredded rotisserie chicken, chopped red onion, Kalamata olives, and crumbled feta cheese, ensuring each piece of chicken is coated.

Taste your Tzatziki Chicken Salad and adjust seasoning if necessary, adding more lemon juice or salt to enhance flavors.

Cover the bowl and refrigerate the salad for at least 30 minutes to allow flavors to meld.

Before serving, give the salad a gentle stir and garnish with fresh parsley if desired. Serve in pita pockets, over greens, or in lettuce wraps.