Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and place them in a large mixing bowl.
Slice the bell peppers and red onion into thin strips, and peel and cube the sweet potato into small 1/2-inch pieces.
Add the vegetables to the bowl with the chicken, then drizzle with the extra virgin olive oil.
Sprinkle the smoked paprika, garlic powder, sea salt, and black pepper over the mixture.
Toss everything thoroughly until the chicken and vegetables are evenly coated in oil and spices.
Spread the mixture onto the prepared sheet pan in a single layer, ensuring nothing is too crowded so it roasts rather than steams.
Roast for 20 to 25 minutes, tossing the ingredients halfway through, until the chicken is cooked through and the sweet potatoes are fork-tender.
Remove from the oven and garnish with freshly chopped parsley for a burst of brightness before serving.