Preheat your oven to 400°F and line a large rimmed sheet pan with parchment paper for easy cleanup.
Dice the chicken breast into 1-inch pieces and cube the sweet potato into small, uniform chunks.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken pieces, sweet potato cubes, broccoli florets, and sliced red bell pepper onto the prepared sheet pan.
Pour the lemon-herb dressing over the chicken and vegetables, tossing thoroughly to ensure every piece is well-coated.
Spread the ingredients out into a single, even layer across the pan to allow for proper roasting and browning.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the sweet potatoes are fork-tender.
Remove from the oven and sprinkle with freshly chopped parsley before serving or packing into meal prep containers.