Add the Greek yogurt to a medium sized bowl. Add the minced garlic cloves, diced red onions, salt, and onion and herb powder. Whisk to combine. Taste and adjust seasonings if needed. Add the cook shredded chicken, followed by the apples and fold until combined. Place the chicken salad in a fridge for about 30 minutes. This will allow the flavors to meld. You can eat this situation right away. It's really good even without wait times.