Rinse and drain the black beans, then mash them roughly in a large bowl, leaving some texture for a hearty bite.
Finely chop the onion, garlic, and cilantro, then stir them into the mashed beans until evenly combined.
Add the breadcrumbs, an egg, lime juice, and cumin to the mixture, then mix gently until all ingredients are just combined—be careful not to overmix.
Divide the mixture into 4 to 6 equal portions and shape each into a patty about 1.5 cm thick with your hands.
Heat the skillet over medium heat and add a splash of oil. Once shimmering, place the patties carefully into the pan.
Cook the patties for about 4-5 minutes on each side, until they develop a golden-brown, crispy crust and are heated through.
Gently flip the patties with a spatula, ensuring they retain their shape and achieve an even, crispy exterior.
Once cooked, transfer the burgers to a paper towel-lined plate to absorb excess oil and rest for a minute.
Serve the black bean burgers hot, with your favorite buns, toppings, or fresh greens for a satisfying meal.