Combine chickpeas, tahini, lemon juice, garlic, olive oil, salt, and cumin in a food processor, then process until the mixture is thick and creamy, scraping down the sides as needed.

With the food processor running, gradually add 2-4 tablespoons of cold water or ice water, one tablespoon at a time, until the hummus reaches your desired smooth and creamy consistency.

Transfer the hummus to a serving bowl, drizzle with extra olive oil, and garnish with paprika or fresh parsley if desired; serve immediately or store in an airtight container.