Preheat the oven to 350 degrees
Place the chicken breasts on a baking sheet, sprinkle with salt and pepper, and bake for 35-40 minutes or until just cooked through. Set aside to cool.
In another bowl, combine the yogurt, mayonnaise, wine or stock, curry powder, 1 1/2 teaspoons of salt, and a few grinds of the pepper mill.
When cool enough to handle, remove the chicken from the bones, discarding along with the skin, and chop the meat into bite-size pieces. Place in a large mixing bowl, and add the celery and onion along with any of the optional mix-ins.
Pour in enough dressing to coat the chicken, reserving any leftover to add when serving, if desired.
Prior to serving, mix in the 1 cup of cashews and serve as is or with optional toppings.