01 - Heat 1 tablespoon of 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 additional minute until fragrant. Remove from heat and let cool slightly.
02 - In a large mixing bowl, mash the drained black beans using a fork or potato masher, leaving some chunks intact for a hearty texture.
03 - Add the sautéed vegetables, rolled oats, breadcrumbs, egg, smoked paprika, cumin, salt, black pepper, and chopped parsley to the mashed beans. Mix thoroughly until all ingredients are well incorporated. If the mixture is too wet, add extra breadcrumbs a tablespoon at a time. If too dry, add a splash of water.
04 - Divide the mixture into 4 equal portions and shape each into a firm burger patty, approximately 3/4 inch thick.
05 - Heat the remaining tablespoon of 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 if desired. Layer each bun with a cooked patty and your choice of toppings including lettuce, tomato slices, pickles, onion, cheese, and sauces. Serve immediately.