Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and dice it into 1/2-inch cubes, then chop the bell pepper and broccoli into uniform, bite-sized florets.
Slice the chicken breast into even 1-inch strips or cubes to ensure they cook at the same rate as the vegetables.
Place the chicken, sweet potato, peppers, and broccoli onto the prepared sheet pan.
Drizzle the extra virgin olive oil over the ingredients, then sprinkle evenly with garlic powder, dried oregano, sea salt, and black pepper.
Use your hands or tongs to toss everything together until every piece is well-coated in oil and seasoning.
Spread the mixture out into a single layer, making sure not to overcrowd the pan so the vegetables roast and caramelize rather than steam.
Roast in the center of the oven for 20-25 minutes, or until the chicken is cooked through and the sweet potatoes are fork-tender and slightly browned.