In a food processor, add chickpeas and pulse until well chopped and somewhat smooth. Transfer to a mixing bowl. Add onion, parsley and garlic to food processor and pulse until finely chopped, then transfer to the bowl with the chickpeas. Add the breadcrumbs and spices and mix until uniformly incorporated. Let mixture rest 20 minutes.
Preheat oven to 375°F. Line a baking sheet with parchment and set aside.
Pour olive oil into a skillet and heat to medium. Divide chickpea mixture into 4, shape into patties, and gently place in hot pan. Cook for 4 minutes, then carefully flip and cook another 4 minutes.
Transfer to a rimmed baking sheet and bake for 15 minutes, until cooked through. Let burgers rest 10 minutes before serving to firm up. Serve with hummus, cucumber, tomato, lettuce, pickled onions, or your favorite toppings.
Notes
If using flour instead of breadcrumbs, start with 2 tablespoons, then add more as needed.