Add all ingredients to a jar with a tight lid and shake until completely combined. Refrigerate for up to 1 week.
To prepare salad:
In a large bowl, toss together chicken, celery, lettuce, bell peppers, onions, and oranges.
Add enough of the dressing to lightly coat. Chill, covered, for up to 2 hours (or serve immediately).
When ready to serve, divide evenly between four plates and garnish with cashews and chow mein noodles.
Notes
For a lighter salad, try decreasing the amount of cashews and chow mein noodles that you use on top. You can also cut the dressing to 1 tablespoon per serving.