Preheat oven to 375 degrees.
Scrub sweet potatoes, cut into fries or wedges, and toss with olive oil in a bowl.
Place in a single layer on baking sheet and bake for 35-45 minutes until golden brown.
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.