In a medium bowl, combine Greek yogurt, minced garlic, lemon juice, and olive oil. Whisk until smooth and creamy, then season with salt and pepper. Set aside.

Wash and finely chop the cucumber and cherry tomatoes. Deseed the cucumber for extra crunch.

Shred cooked chicken if using rotisserie, or grill chicken until done. Set aside.

In a large bowl, combine shredded chicken, chopped cucumber, halved cherry tomatoes, and sliced red onion. Toss gently.

Finely chop dill and sprinkle over the mixture. Mix well.

Pour the tzatziki sauce over the chicken and vegetable mixture, gently folding until everything is well coated.

Taste and adjust seasoning with salt, pepper, or lemon juice.

Serve immediately or chill for 30 minutes before serving.