Drain and rinse the black beans with cold water, then mash them with a fork or immersion blender in a large bowl.
Finely chop the red onion and garlic, then sauté them with the diced bell pepper in one tablespoon of olive oil in a skillet until softened.
Add the sautéed onion mixture to the mashed beans. Sprinkle in the rolled oats, breadcrumbs, smoked paprika, salt, and pepper, then stir in the BBQ sauce.
Thoroughly mix the ingredients together, then form them into 4 equally sized patties. If the mixture is too soft, you can add a little more breadcrumbs.
Place the patties on a tray and let them chill in the refrigerator for 30 minutes to firm up.
Heat one tablespoon of olive oil in a skillet, then cook the bean patties over medium heat for about 4-5 minutes per side.
During the last minute of cooking, place a slice of vegan cheese on top of each patty and cover the skillet to allow the cheese to melt slightly.
Halve the hamburger buns and toast them in a dry skillet or oven until lightly crispy.
Spread the bottom half of each bun with vegan mayonnaise, then top with a lettuce leaf and the cheese-melted bean patty.
Add the tomato slice, then drizzle with a little ketchup and mustard.
Place the top half of the bun on top and serve with a fresh salad or French fries.
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