Place the prepared chicken into a medium-sized mixing bowl. Add the mayonnaise, chopped celery, sliced green onion, Dijon mustard, seasoned salt, black pepper, and dill if using.
Stir thoroughly until all components are well incorporated and the salad achieves a creamy, uniform texture.
Sample the mixture and adjust seasoning with additional salt or pepper as needed.
Serve the chicken salad between slices of bread for a sandwich, tucked into a wrap, or spooned over a fresh bed of greens.