In a large mixing bowl, combine Greek yogurt, shredded cucumber, lemon juice, dill, garlic powder, and season with salt and pepper to taste. Mix until well blended.

Fold in shredded chicken, chopped red onion, and kalamata olives into the tzatziki mixture, ensuring even distribution.

Mix in crumbled feta and parsley, stirring gently until all ingredients are well incorporated.

Taste and adjust the seasoning with additional salt, pepper, or lemon juice as needed.

Present the salad in a serving bowl, garnishing with extra dill, feta, or a drizzle of olive oil.