Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Chop the chicken breast into 1-inch cubes and dice the sweet potato into small half-inch pieces to ensure they cook at the same rate.
Place the chicken cubes, diced sweet potatoes, broccoli florets, and sliced red 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, then use your hands or tongs to toss everything until evenly coated.
Spread the ingredients into a single layer across the pan, making sure not to overcrowd the pieces so they roast and develop color.
Bake for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are fork-tender.
Remove from the oven and let rest for 5 minutes before dividing into meal prep containers for a healthy, ready-to-go meal.