Reserve ⅓ cup beans. Place remaining beans in a medium bowl and mash with a fork.
Add yogurt, 4 tablespoons green onions, chipotle, garlic powder, ¼ teaspoon salt and egg; stir well.
Fold in panko and reserved ⅓ cup beans.
Divide mixture into four equal portions, shaping each into a ½-inch thick patty.
Heat a large nonstick skillet over medium heat. Add oil to pan, swirling to coat.
Place patties in pan and cook until browned on the bottom, 4–5 minutes.
Carefully turn patties over; cook until browned on the opposite side, 4–5 minutes more.
Meanwhile, combine avocado, tomato, lime juice, remaining 2 tablespoons of green onions and ¼ teaspoon salt; toss gently to combine.
Top burgers with salsa and serve.
