In a large bowl, whisk together all of the dressing ingredients until smooth.
Add the chicken, romaine lettuce and, if using, croutons, to the bowl with the dressing. Toss well to coat all of the ingredients.
Place tortillas on a large plate. Spoon filling onto one side of the tortilla and roll up tightly, wrapping like a burrito. Secure the sides with toothpicks if you like.
Notes
Makes 4 wrap sandwiches.To make this dairy free, use dairy-free parmesan shreds instead of regular parmesan cheese.