For spices, I usually just sprinkle a tablespoon or so of everything bagel seasoning in addition to the salt, but za'atar would be great too, or paprika and a bit of cayenne for some heat.I store them at room temperature when I know I'll be using them over the next few days, otherwise I keep them in the refrigerator for a few weeks. You can also freeze them.
Place the chickpeas in a food processor and pulse until they are broken down into small pieces and crumbs.
Place the chickpea crumbs on the baking sheet and drizzle the olive oil over them. Add salt and other toppings and blend it into the chickpeas with your hands or a spatula.
Bake for 15 minutes. Shuffle the chickpeas a bit to move them around and bake for another 10 minutes or so, or until they turn golden.
Cool and enjoy! Store them at room temperature for a few days, in the refrigerator for a few weeks, or freeze for a few months.