In a medium bowl, whisk together Greek yogurt, curry powder, and mayonnaise until smooth and well combined.
Add the shredded chicken to the curry mixture and gently fold until each piece is evenly coated.
Incorporate the diced red onion, apple, raisins, and chopped cilantro, folding gently to distribute ingredients evenly.
Season with salt and freshly ground black pepper to taste, starting with 1/4 teaspoon of each.
Cover and refrigerate for at least 20 minutes to allow flavors to meld.
Before serving, taste and adjust seasonings if needed. Add any optional ingredients at this point.
Serve chilled on a bed of greens, in a wrap, or as a sandwich filling.