Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the chicken breast and sweet potato into uniform 1-inch cubes to ensure even cooking.
In a large bowl, toss the chicken and sweet potato cubes with olive oil, garlic powder, smoked paprika, sea salt, and black pepper until well coated.
Spread the mixture in a single layer on the prepared baking sheet and roast for 20 minutes.
Rinse and drain the black beans, then add them to the baking sheet, tossing gently with the chicken and potatoes.
Roast for an additional 5 minutes until the chicken is cooked through and the potatoes are tender and golden.
Remove from the oven and immediately stir in the baby spinach, allowing the residual heat to wilt the leaves slightly.
Drizzle the entire bowl with fresh lime juice and serve warm.