Lay the large flour tortillas on a cutting board. Divide the deli sliced chicken breast, Romaine lettuce, parmesan cheese, dressing and onion between all the tortillas.
Tightly roll up the tortillas, enclosing the filling. Slice in half and enjoy.
Notes
Substitute the deli sliced chicken breast with equal amounts shredded chicken or grilled chicken.Serving size is one large tortilla (two halves).