Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel the sweet potato and cut it into 1/2-inch cubes, and slice the chicken breast into bite-sized pieces.
Place the chicken, sweet potato cubes, and broccoli florets onto the prepared baking sheet.
Drizzle the olive oil over the ingredients and sprinkle evenly with sea salt, black pepper, garlic powder, and smoked paprika.
Toss everything together with your hands or tongs until the chicken and vegetables are well coated in oil and spices.
Spread the mixture into a single layer, ensuring the pieces aren't too crowded to allow for proper browning.
Roast for 20 to 25 minutes, or until the chicken is cooked through and the sweet potatoes are tender and golden.
Remove from the oven and squeeze the fresh lemon juice over the entire tray before serving in a bowl.