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 are 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 partially, leaving some chunks intact for a satisfying 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. Press the edges together to prevent crumbling during cooking.
05 - Heat the remaining tablespoon of olive oil in a skillet over medium-high heat. Carefully place the patties in the skillet 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 or indoor grill for similar timing.
06 - Toast the burger buns lightly if desired. Place each cooked patty on a bun and top with lettuce, tomato slices, pickles, onion, cheese, and your preferred sauces. Serve immediately while hot.