Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and cut it into 1/2-inch cubes, then dice the chicken breast into bite-sized pieces of similar size.
Place the chicken and sweet potato on the prepared baking sheet, then drizzle with olive oil.
Sprinkle the garlic powder, smoked paprika, onion powder, sea salt, and black pepper over the ingredients and toss until everything is evenly coated.
Spread the mixture into a single layer, ensuring there is space between the pieces to allow for proper browning.
Roast for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the sweet potatoes are tender and golden.
Remove from the oven and garnish with freshly chopped parsley before serving.