In a mixing bowl, combine the mixed salad greens, sliced radishes, and blanched broccoli florets. Toss to combine.
In a separate small bowl, whisk together the olive oil and za'atar spice until well mixed.
Pour the za'atar dressing over the salad mixture and gently toss to coat all the ingredients evenly.
Add the black beans to the salad, gently folding them in without mashing.
Transfer the salad to a serving dish and garnish with fresh parsley and cracked black pepper, adding optional feta cheese or walnuts if desired.
Serve immediately, or allow the salad to sit for a few minutes to let the flavors meld.
