- 1 can of chicken breast (drained)
- 1/4 cup mayonnaise
- 1 tbsp mustard (optional)
- 1/4 cup finely chopped celery
- 1/4 cup finely chopped red onion
- 1 tbsp chopped fresh parsley (or 1 tsp dried parsley)
- Salt and pepper to taste
- Lettuce leaves or bread for serving
