Mash the black beans in a large bowl until they are chunky.

In a skillet over medium heat, sauté the finely chopped onion and minced garlic until fragrant, about 3-4 minutes.

Mix the sautéed onion and garlic into the mashed beans. Add in breadcrumbs, ground cumin, chili powder, and egg. Stir everything together until well combined.

Form the mixture into patties that are about ½ inch thick.

Heat oil in a skillet over medium-high heat. Cook the patties for about 4 minutes on each side or until they are golden brown and crispy.