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Preheat a medium saucepan over medium heat. Once the saucepan is hot, add oil and swirl to coat the bottom.
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Add the onion and garlic to the saucepan; cook, stirring frequently, until slightly softened, 4-5 minutes.
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Drain and rinse the beans in a colander; add to the saucepan with the onion. Stir to combine.
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Add the ketchup, vinegar, soy sauce, Dijon, brown sugar, and spices to the saucepan. Reduce heat to low and simmer, stirring occasionally, while you make the slaw.
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In a large bowl, whisk together the mayonnaise, vinegar, Dijon, maple syrup, and onion powder.
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Add the cabbage, carrots, and green onion to the bowl with the dressing and toss to combine. Set aside.
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Toast the buns if desired.
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Divide the bean mixture between buns and top with slaw.
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