Instructions

  1. Heat oven to 450 degrees.
  2. Place sweet potatoes on a rimmed baking sheet; drizzle with 1 tablespoon oil. Season with cumin, red-pepper flakes (if using), salt, and pepper; toss to coat.
  3. Roast on lower rack, until tender, tossing once during cooking, 25 to 35 minutes.
  4. In a large bowl, whisk lime juice with remaining 2 tablespoons oil; season with salt and pepper. Add sweet potatoes, beans, onion, and cilantro; mix gently to combine.