Toss chicken with 1/4 cup of the mustard and salad dressing; set aside.
Spread each tortilla with 1 Tbsp mustard. Arrange lettuce, cheese and chicken mixture in center of each tortilla, dividing evenly. Fold sides of tortilla toward center; roll up to enclose filling. Microwave on HIGH for 1 minute until heated through and cheese is melted. Cut in half to serve. May be eaten immediately or microwaved later.Servings: