Drain and rinse the black beans in a colander until the water runs clear. Let the beans sit to drain properly.

Heat 1 tablespoon of oil in a skillet over medium heat. Add onions and garlic, sauté for 3-4 minutes until onions turn translucent.

In a mixing bowl, mash the rinsed black beans with a fork, leaving some chunks for texture. Mix with sautéed onions and garlic.

Stir breadcrumbs, beaten egg (or flaxseed meal), cumin, chili powder, salt, pepper, and optional cilantro into the mixture until combined.

Divide the mixture into equal portions and shape each into a patty about 1 inch thick.

Heat 2 tablespoons of oil in a skillet over medium-high heat. Cook patties for 4-5 minutes on each side until golden brown.

Toast burger buns if desired, and assemble the black bean burgers with your favorite toppings.