01 - Heat 1 tablespoon of olive oil in a skillet over medium heat. Add the chopped onion, grated carrot, and diced bell pepper. Sauté for 3 to 4 minutes until the vegetables have softened. Add the minced garlic and cook for 1 additional minute until fragrant. Remove from heat and let cool slightly.
02 - Place the drained and rinsed black beans in a large mixing bowl. Using a potato masher or fork, mash the beans until mostly smooth but leaving some chunks intact for a hearty texture.
03 - Add the sautéed vegetables, rolled oats, breadcrumbs, egg, smoked paprika, ground cumin, salt, black pepper, and chopped parsley to the mashed beans. Mix thoroughly until all ingredients are evenly incorporated. If the mixture is too wet, add additional breadcrumbs one tablespoon at a time. If too dry, add a splash of water.
04 - Divide the mixture into 4 equal portions. Shape each portion into a firm burger patty approximately 3/4 inch thick, pressing firmly to ensure they hold together during cooking.
05 - Heat the remaining 1 tablespoon of olive oil in a skillet over medium-high heat. Carefully place the patties in the pan and cook for 4 to 5 minutes per side until golden brown and heated through. Alternatively, grill the patties over medium heat on an outdoor grill for similar timing.
06 - Toast the burger buns if desired. Place each cooked patty on a bun and top with lettuce, tomato slices, pickles, onion, cheese if using, and your choice of sauces. Serve immediately while hot.