Pre-heat the oven to 450 degrees F.
In a medium bowl, toss chickpeas with olive oil and 1/4 teaspoon of salt. Roast for
Line a baking sheet with foil and spread evenly with the chickpeas. Roast for 30 minutes, or until toasted and browned slightly, tossing periodically.
Remove the chickpeas from the oven and toss immediately in za'atar.
Mash up the avocados in a bowl and season with salt, pepper and lime juice to taste. Keep it on the less salty side because the preserved lemons adds saltiness.
Top bagel halves with avocado mash, chickpeas, preserved lemons, chili pepper flakes if desired, and mint or basil. Eat!