Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and cut it into 1/2-inch cubes; chop the red bell pepper into 1-inch pieces and break the broccoli into bite-sized florets.
Pat the chicken breast dry with a paper towel and slice it into even 1-inch strips to ensure quick and uniform cooking.
In a large mixing bowl, toss the chicken strips, sweet potato cubes, broccoli, and bell peppers with the extra virgin olive oil until well coated.
Sprinkle the dried oregano, garlic powder, sea salt, and black pepper over the mixture and toss again to distribute the savory herbs evenly.
Spread the chicken and vegetables in a single layer on the prepared baking sheet, ensuring they aren't overcrowded so they roast rather than steam.
Roast in the center of the oven for 20 to 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 finely chopped fresh parsley before serving warm.