In a medium pot over medium heat, sauté onion in the oil until translucent, 3-5 minutes.
Stir in the quinoa and cook for 1-2 minutes more.
Add water and broth and bring to a boil.
Cover pot and simmer for 15-20 minutes. Turn off heat.
Coarsely mash garbanzo beans with a fork or masher.
Add remaining ingredients, except oil and buns, and mix thoroughly. Form into four patties.
Meanwhile, heat oil in large skillet and cook over medium heat until brown. Flip over and brown other side.