canned chicken recipe

2 cans (12.5 ounces each) of canned chicken, drained - 1/2 cup mayonnaise - 1 tablespoon Dijon mustard - 1/4 cup finely chopped celery - 1/4 cup finely chopped red onion - 1 tablespoon fresh lemon juice - Salt and black pepper to taste - 1/4 cup chopped fresh parsley - Lettuce leaves (for serving) - Bread or crackers (for serving)