In a medium bowl, combine the plain Greek yogurt with the curry powder. Add the chopped or shredded cooked chicken to the mixture and mix it until all the chicken has been coated well. Add the sliced grapes to the chicken salad and mix.

Place the tortilla on a flat surface and layer a couple of lettuce leaves on top.

Scoop the curried chicken salad on top of the lettuce, placing it in the middle of the tortilla.

Fold in the two sides and then one end over the chicken salad, rolling it tightly into a wrap. Slice in half.

Place the chicken wrap inside the main compartment of a lunchbox along with some fruit and veggies. Cover with the lid and refrigerate until ready to pack inside a lunch bag with or without an ice pack.