Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Dice the sweet potato into 1/2-inch cubes and chop the red bell pepper and broccoli into uniform, bite-sized pieces.
Cut the chicken breast into even 1-inch cubes to ensure they cook at the same rate as the vegetables.
In a large mixing bowl, combine the cubed chicken, sweet potato, broccoli, and bell pepper.
Drizzle the olive oil over the mixture and sprinkle with sea salt, black pepper, garlic powder, paprika, and dried oregano.
Toss everything thoroughly with your hands or a large spoon until every piece is well-coated in oil and spices.
Spread the chicken and vegetable mixture in a single layer on the prepared baking sheet, ensuring they aren't overcrowded.
Bake for 20 to 25 minutes, or until the chicken is cooked through and the sweet potatoes are tender and slightly caramelized.