01 - In a large mixing bowl, mash the drained black beans with a fork or potato masher until coarse and partially smooth, leaving some texture intact.
02 - Add the grated carrots, chopped mushrooms, diced red onion, corn kernels, minced garlic, parsley, rolled oats, breadcrumbs, smoked paprika, cumin, salt, and pepper to the mashed beans.
03 - Add the egg (or prepared flax egg) to the bowl and mix thoroughly until all ingredients are evenly combined and the mixture holds together when pressed.
04 - Divide the mixture into 4 equal portions and shape each into a burger patty approximately 1 inch thick.
05 - Heat olive oil in a large skillet over medium heat. Cook the patties for 4 to 5 minutes per side until golden brown and cooked through.
06 - Toast the burger buns lightly in a skillet or oven until golden.
07 - Place each patty on a toasted bun and top with lettuce, tomato slices, pickles, and your favorite sauces. Serve immediately.