Drain the chickpeas (save the aquafaba if desired) and rinse well. Leave in the colander to drain while you prepare the dressing.
Whisk together 1/4 cup olive oil, 1/4 cup tahini, 3 Tablespoons lemon juice, minced garlic, 1/2 teaspoon salt, 1/4 teaspoon cinnamon, 1/4 teaspoon cumin, 1/8 teaspoon smoked paprika, and 1 pinch cayenne until smooth. Stir in the drained chickpeas.
Divide 5 ounces arugula or mixed greens between 4 bowls. Divide the chickpea mixture into 4 equal portions and spoon it on top of the lettuce in the bowls. Garnish with sumac, paprika, or minced parsley if desired. Serve immediately.