In a large mixing bowl, mash the black beans with a fork or potato masher, leaving some texture.
Stir in onion, breadcrumbs, cilantro, garlic powder, paprika, cumin, and egg. Mix until combined.
Form into 4 even patties (approx. 4 oz each). Refrigerate for at least 15 minutes to set.
Heat oil in a flat-top griddle or non-stick skillet over medium heat. Cook patties 4–5 minutes per side until browned and heated through.