Prep: 1. Peel and cut sweet potatoes into 1-inch chunks. Place sweet potatoes in a saucepan and cover with water. Bring to a boil and cook until just tender, about 7 minutes. Drain and transfer to a bowl. 2. Meanwhile, seed and cut bell pepper into 1/4-inch dice. 3. Finely chop cilantro and scallions (white and light green parts). Make: 1. Whisk together olive oil, lime juice, chili powder, cumin, cilantro, salt, and pepper. 2. Add the red bell pepper and scallions to the potatoes and toss with the dressing. Season with salt and pepper.