Drain and rinse the black beans under cold water. In a large bowl, mash them with a fork or an immersion blender.
Finely chop the red onion and garlic. Sauté them with the diced bell pepper in a tablespoon of olive oil in a skillet until softened.
Add the sautéed onion mixture to the mashed beans. Stir in the oatmeal, breadcrumbs, baking powder, smoked paprika, salt, and pepper.
Mix all the ingredients thoroughly. Form the mixture into 4 equally sized patties. If the mixture is too soft, 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 a tablespoon of olive oil in a skillet over medium heat. Cook the bean patties for about 4-5 minutes per side.
In the last minute of cooking, place a slice of vegan cheese on 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 vegan mayonnaise on the bottom half of each bun. Add a lettuce leaf and the cheese-melted bean patty.
Top with tomato slices, then drizzle with ketchup and mustard.
Place the top half of the bun on top and serve with a side salad or French fries.
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