Heat the olive oil over medium heat. Add the mustard seeds and sauté until they start popping. Add the cumin seeds and sauté for a few seconds. Add the curry leaves, if using. Add the chickpeas and sauté for about two minutes. Add the turmeric, salt, and chili powder. Mix well and take off the heat. Place in a serving bowl, top with cilantro, onion, and a big nice squeeze of fresh lime juice. Bon appétit!