1. Whisk together dressing and mustard to blend.
2. Drizzle a small amount of dressing on the grilled sliced chicken.
3. Toss chicken, lettuce and Parmesan cheese with remaining dressing.
4. Place 1/4 th of mixture onto tortilla shell, fold and wrap.
Tip: For a cold sandwich to serve anytime, simply chill the grill the chicken, assemble the wrap and refrigerate.