Rinse garbanzo beans using a strainer. Add rinsed beans to a bowl of room temperature water (not hot or particularly cold). Remove outer skins from garbanzo beans. You do not need to remove 100% of them, just as many as you can. Discard skins.
Add all ingredients, except cilantro, to food processor and process until smooth and creamy, AT LEAST 3-4 minutes, preferably 5. Add more water if needed to reach desired consistency.
Top hummus with chopped cilantro and additional chopped chilies before serving if desired.