The name of this recipe is Shredded Chicken And Arugula Flatbread, so if you want to make this exact recipe, we recommend using shredded chicken. If you have a rotisserie chicken, you can use that chicken to make the shredded chicken. That's a lot easier since you don't have to cook the chicken first. But, if you have leftover chunk chicken from something like chicken salad, you can go ahead and use that instead. We like shredded chicken in this recipe because it's a little thinner and keeps the flatbread feeling airy, but you can make this however you like.