In a medium bowl, mix the chicken with the shredded cheese and Ranch dressing until combined.
Place the tortilla on a flat surface and place the chicken salad in the middle with the shredded lettuce. Fold and tuck the sides in before rolling tightly. Wrap with a paper towel or plastic wrap to keep the filling intact.
Cut the wrap in half and pack it inside a compartmentalized lunch container. Add your favorite fruit and veggies as sides.
Pack for Lunch:
Close the container and place it in a lunch bag with an ice pack.
Notes
The chicken filling can be made up to 3 days ahead.
Rotisserie chicken is my favorite shortcut, but leftover cooked chicken works too.
Wrapping the tortilla before slicing helps keep the filling from falling out during lunch.