Preheat oven to 375 degrees. Place chickpeas on baking sheet and toss with 1/2 tablespoon oil. Bake for 15 minutes to remove moisture.
Meanwhile, heat 1 teaspoon oil in a medium skillet. Add the garlic and cook for 15 seconds. Add spinach and cook, tossing with tongs, until the spinach is completely wilted, 2 or 3 minutes. Transfer to a colander to drain and cool. Place the spinach in a clean dishcloth and squeeze to remove as much moisture as possible. Transfer to a cutting board and chop finely.
Combine the roasted chickpeas, bread, egg, lemon juice and zest, and salt in a food processor. Pulse until the mixture is just combined. You want small chunks, not a smooth mixture.
In a large bowl, combine the spinach with the mint and feta. Add the bean-egg mixture and stir thoroughly. Chill for at least 1 hour. The mixture will be a little sticky but somewhat pliable.
In an oven-safe skillet or nonstick sauté pan, heat the remaining 1 1/2 tablespoons oil over medium-high heat. Shape the mixture into patties and place in hot pan (I find it easier to form each patty and place directly into the pan). Cook until browned on 1 side, about 3 minutes. Carefully turn over and cook for another 3 minutes or until browned. Transfer the pan to the oven and bake for 12 to 15 minutes, until the burgers are firm and cooked through.
Nutrition information per serving: