Add beans to a bowl and mash with a fork until chunky. Add the egg and mix well.
Add precooked rice, scallions, garlic and oregano, salt and pepper and mix until well combined.
Divide the mixture into 4 portions and form each portion into a patty about ¾ to 1 inch thick.
Place a large skillet on the stove on high heat. When the skillet is hot, add oil. Add burgers and cook 4 to 5 minutes per side until browned on both sides and heated throughout. Place on a whole wheat bun.