Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel and dice the sweet potato into 1/2-inch cubes, and cut the chicken breast into similar bite-sized pieces.
Place the sweet potato and chicken on the baking sheet, drizzle with olive oil, and sprinkle with chili powder, sea salt, and black pepper.
Toss everything together until evenly coated, then spread in a single layer.
Roast for 20-25 minutes, or until the sweet potatoes are fork-tender and the chicken is fully cooked through.
While the tray roasts, rinse and drain the black beans and warm them briefly in a small saucepan or microwave.
Place the fresh spinach in a serving bowl and top with the hot roasted sweet potato, chicken, and warm black beans.
Drizzle the entire bowl with fresh lime juice and toss gently to allow the heat to slightly wilt the spinach before eating.