Begin by marinading the chicken: in a medium bowl, whisk together lemon juice, olive oil, garlic, salt and pepper. Add chicken cubes to the bowl and toss well. Marinate for 20 minutes.
While chicken is marinading, preheat oven to 350 degrees. Place the pita pieces in a medium bowl and toss well with olive oil, salt and za'atar. Line a baking sheet with foil and spray with nonstick cooking spray. Spread pita in a single layer then bake until crispy, about 10-12 minutes or until golden brown.
To prepare the salad, place all of the veggies in a large bowl (romaine through parsley) then sprinkle with the baked pita chips, gently crunching them up in your hands. Drizzle salad with the dressing ingredients then toss well.
To cook the chicken, place a large skillet over medium-high heat. Once warmed, add the chicken. Saute chicken until golden brown, stirring frequently, about 9-12 minutes.
To serve, place fattoush salad on a large plate and add chicken on top right before serving.
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Notes
I love making this salad with leftover, cold chicken tawook but if you are using warm chicken, wait to top the salad until just before serving to avoid wilting the lettuce.You can whisk the salad dressing in a small bowl but I typically skip that step and just drizzle over the salad greens directly.