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Adjust rack to top position and preheat oven to 425 degrees. Wash and dry produce.
Cut potatoes into ½-inch-thick wedges. Halve, peel, and thinly slice onion; mince a few slices until you have 2 TBSP (4 TBSP for 4 servings). Drain and rinse beans. Reserve ½ tsp BBQ seasoning (1 tsp for 4) in a small bowl. Halve buns.