Chop the parsley for 5 seconds; remove and reserve (seemed a little unnecessary). Add garlic and finely chop for about 5 seconds. Add chickpeas, tahini, lemon juice, water, cumin, jalapeno, and reserved parsley to work bowl; process until smooth for about 1.5 to 2 minutes, stopping to scrape work bowl as needed once or twice. With the machine running, add the olive oil in a steady stream and process until the mixture is smooth and creamy.