Drain and rinse the black beans with cold water, then mash them with a fork or potato masher in a large bowl. It's best to leave some small chunks for better texture.
Finely chop the onion and garlic. Dice the bell pepper. Sauté them in a tablespoon of olive oil in a skillet until softened and lightly caramelized.
Add the sautéed onion mixture to the mashed beans. Sprinkle in the rolled oats, breadcrumbs, smoked paprika, ground cumin, salt, and pepper.
Crack in the egg and mix everything thoroughly until you have a well-combined mixture that can be easily formed. If it's too soft, add a little more breadcrumbs.
With damp hands, form 4 equally sized patties from the mixture. Place them on a tray and chill in the refrigerator for 30 minutes to firm up.
Heat a tablespoon of olive oil in a skillet over medium heat. Cook the black bean patties for about 4-5 minutes per side, until golden brown and cooked through.
Halve the hamburger buns and toast them in a dry skillet or oven until slightly crispy.
Assemble the burgers: place a lettuce leaf on the bottom half of the toasted bun, then top with a black bean patty. Add a slice of tomato, then drizzle with a little mustard and ketchup.
Place the top half of the bun on top and serve immediately. Serve with fries or a fresh salad as a side.
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