Pinch skins from chickpeas and place peas in the bowl of a food processor fitted with a steel blade.
Squeeze out garlic cloves from the papery skins and place in the food processor along with the preserved lemons.
Puree mixture until smooth, then add the tahini, lemon juice, and salt, pulsing a couple of times, then add the olive oil in a steady thin stream through the chute.
For the pita toasts. brush the pita with oil and sprinkle with za'atar, then cut into wedges.
Air-fry the pita at 400F for 2 minutes using a Breville Smart Air oven or you can also bake these at 400 for 10-15 minutes until crisp.
Serve hummus with pita chips.