Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into bite-sized 1-inch cubes and chop the sweet potato into 1/2-inch cubes to ensure they cook at the same rate.
Slice the red bell pepper into strips and break the broccoli into small, uniform florets.
Place the chicken, sweet potatoes, broccoli, and peppers onto the prepared sheet pan.
Drizzle the extra virgin olive oil over the ingredients and sprinkle evenly with garlic powder, dried oregano, sea salt, and black pepper.
Use your hands or tongs to toss everything together until the chicken and vegetables are thoroughly and evenly coated in the oil and spices.
Spread the mixture out into a single layer, ensuring nothing is overcrowded so the vegetables roast rather than steam.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the sweet potatoes are tender when pierced with a fork.
Remove from the oven and let rest for 5 minutes before serving or portioning into meal prep containers.