Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Dice the small sweet potato into 1/2-inch cubes and chop the red bell pepper into bite-sized pieces.
Slice the chicken breast into even 1-inch strips to ensure they cook quickly and remain juicy.
Place the chicken strips, sweet potato cubes, broccoli florets, and bell peppers onto the prepared sheet pan.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Drizzle the lemon-herb dressing over the chicken and vegetables, tossing thoroughly with your hands or tongs to ensure an even coat.
Spread the ingredients out into a single layer, making sure not to overcrowd the pan so the vegetables roast rather than steam.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender.
Remove from the oven and garnish with freshly chopped parsley before serving warm.