In a large mixing bowl, mash the black beans with a fork or potato masher until mostly smooth, leaving some chunks for texture.
Add the breadcrumbs, bell pepper, onion, cilantro, chili powder, cumin, garlic powder, salt, black pepper, and egg to the bowl. Mix everything together until well combined.
Divide the mixture into four equal portions and shape into patties. Make sure they are packed tightly to hold together during cooking.
Heat a frying pan or skillet over medium heat and spray with cooking spray or add a small amount of oil.
Once hot, add the patties to the pan and cook for about 5-7 minutes on each side, or until they are golden brown and heated through.
While the patties are cooking, you can toast the burger buns lightly in the same pan if desired.
Assemble your burgers by placing the cooked patty on the bun and adding any optional toppings like avocado, salsa, lettuce, or cheese.