Place the name root in a large saucepan and cover with water. Bring to a boil and cook until just tender, 7 to 10 minutes. Drain and transfer to a large bowl.
While the name is cooking, make the dressing. Whisk together the olive oil, lime juice, chili powder, cumin, cilantro, salt, and pepper in a small bowl.
Add the red bell pepper and scallions to the potatoes and toss with the dressing. Season again with salt and pepper.
Serve warm or refrigerate and bring to room temperature before serving.
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