In a large bowl, whisk together the mayonnaise, sour cream or Greek yogurt, curry powder, mustard, honey, lemon juice, pepper, and salt.
Add the chopped chicken, celery, onion, raisins, diced apples, or fruit of your choice and scallions to the dressing. Toss well to combine, then taste and adjust seasoning, Add cayenne pepper, if desired for extra heat.
Transfer the chicken salad into a covered container and chill until ready to serve. Right before serving, stir in the toasted nuts to preserve the crunchy texture.