Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and halve the baby potatoes to ensure even cooking across the pan.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper to create the marinade.
Place the chicken, broccoli florets, sliced bell peppers, and potatoes on the prepared sheet pan.
Pour the lemon-herb marinade over the ingredients and toss thoroughly with your hands or tongs to coat every piece evenly.
Spread the mixture into a single layer, ensuring the chicken and vegetables are not overcrowded so they roast rather than steam.
Roast in the center of the oven for 20-25 minutes, or until the chicken is cooked through and the potatoes are tender and golden.
Remove from the oven and let the chicken rest for 5 minutes before portioning into meal prep containers for the week.