Drain and rinse the black beans with cold water. Mash them with a fork or immersion blender in a large bowl.
Finely chop the onion and garlic. Sauté them with the diced red bell pepper in one tablespoon of olive oil in a skillet until softened.
Add the sautéed onion mixture to the mashed beans. Stir in the rolled oats, breadcrumbs, baking powder, smoked paprika, salt, and pepper.
Thoroughly mix the ingredients. 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 refrigerate for 30 minutes to firm up.
Heat one tablespoon of olive oil in a skillet over medium heat. Cook the bean patties for about 4-5 minutes per side, until golden brown.
During 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.
In another skillet, cook the vegan bacon slices for a few minutes until crispy.
Halve the hamburger buns and toast them in a dry skillet or oven until lightly golden and crispy.
Spread vegan mayonnaise on the bottom half of each bun. Top with a lettuce leaf and the cheese-melted bean patty.
Add the crispy vegan bacon slice, a slice of tomato, and then drizzle with a little ketchup and mustard.
Place the top of the bun on and serve with a fresh salad or fries.
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