Preheat oven to 400°F and line a large baking sheet with parchment paper.
Peel and dice the sweet potato into 1/2-inch cubes and slice the bell pepper into thin strips.
In a small bowl, whisk together the olive oil, lime juice, lime zest, chili powder, smoked paprika, garlic powder, onion powder, salt, and pepper.
Place the chicken thighs, sweet potatoes, and bell peppers on the prepared baking sheet.
Drizzle the spice and oil mixture over everything, tossing well to ensure every piece is evenly coated.
Spread the ingredients into a single layer, ensuring the chicken isn't crowded by the vegetables to allow for proper browning.
Roast for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender and golden.
Let the chicken rest for 5 minutes before serving to ensure the juices redistribute for maximum flavor.