Step 1

Combine 2 tablespoons tahini, lemon juice, 1 teaspoon miso, 1/2 teaspoon onion powder, 1/4 teaspoon garlic powder and 1/4 teaspoon pepper in a small bowl. Gradually whisk in water until the mixture is smooth. Stir in 1 teaspoon chives. Set aside.

Step 2

Place chickpeas, cumin, salt and the remaining 2 tablespoons tahini, 2 teaspoons miso, 1 teaspoon garlic powder, 1 teaspoon pepper and 3/4 teaspoon onion powder in a food processor. Pulse, stopping once or twice to scrape down the sides, until a coarse mixture forms that holds together when pressed. Add parsley and the remaining 2 tablespoons chives; pulse until the herbs are finely chopped and incorporated into the mixture. Transfer to a bowl.

Step 3

Squeeze zucchini in a clean kitchen towel to remove extra moisture. Add the zucchini and oats to the chickpea mixture; use your hands to combine, pressing to mash together. Form into 4 patties.

Step 4

Heat oil in a large nonstick skillet over medium-high heat. Add the patties and cook until golden and beginning to crisp, 4 to 5 minutes. Carefully flip and cook until golden brown, 2 to 4 minutes more.

Step 5

Serve the burgers on buns with the tahini-ranch sauce, arugula and tomato slices.