01 - Heat 1 tablespoon olive oil in a skillet over medium heat. Add the onion, carrot, and bell pepper. Sauté for 3-4 minutes until softened. Add the minced garlic and cook for 1 more 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 fork or potato masher, mash the beans until mostly smooth but leaving some chunks 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 well combined. If the mixture is too wet, add more breadcrumbs a 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 firmly so the patties hold together during cooking.
05 - Heat the remaining 1 tablespoon olive oil in a skillet over medium-high heat. Cook the patties for 4-5 minutes per side until golden brown and heated through. Alternatively, grill the patties over medium heat for a charred finish.
06 - Toast the burger buns lightly if desired. Place each patty on a bun and top with lettuce, tomato slices, pickles, onion, cheese, and your preferred sauces. Serve immediately.