Pre-heat the oven to 400 degrees.
Brush the pitas with the olive oil and sprinkle on the za’atar. Place on a baking sheet lined with parchment paper and crisp in the oven for 10 minutes.
Cut or tear the pita into bite size.
Whisk together the sumac vinaigrette ingredients to make the dressing.
Assemble the salad by tossing together the vegetables and pita pieces. Arrange on a platter and drizzle on the vinaigrette. For best flavor, let stand for a few minutes to allow the pita to absorb the dressing.