Place the shredded chicken breast in a large mixing bowl. Add the chopped red onion, chopped celery, and chopped parsley.
In a separate bowl, add the mashed avocado, Greek yogurt, olive oil, lemon juice, garlic powder, salt, and black pepper.
Use a spoon or fork to mix everything together until the dressing is smooth and creamy.
Pour the avocado dressing over the chicken mixture.
Gently mix until all the chicken and vegetables are evenly coated with the creamy avocado dressing.
Taste the salad and add a little more salt or pepper if desired.
Serve immediately as a healthy lunch on its own, in a sandwich, lettuce wrap, or with crackers.
