Combine potato mixture, panko (or breadcrumb substitute), 1.5 Tbs lime juice, chickpeas, and egg (or egg substitute) in a food processor; pulse until chickpeas are coarsely ground. Divide potato mixture into 4 equal portions, shaping each into a 4 inch patty. Return skillet to medium-high heat. Add remaining oil to pan and swirl to coat. Add patties to pan; cook 3 minutes or until browned. Carefully turn patties over and brown on other side. Remove from pan.