In a large bowl, combine the mayonnaise, Dijon mustard, lemon juice, salt, and pepper. Whisk until smooth.
Add the diced or shredded turkey and toss to coat evenly.
Fold in the celery, dried cranberries, and toasted pecans.
Stir in the fresh parsley.
Taste and adjust seasoning as needed.
Serve immediately on bread, croissants, or over a bed of greens. Can also be chilled for 30 minutes for flavors to meld.