Preheat your oven to 400°F and line a large rimmed sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and slice the baby potatoes into halves or quarters to ensure they cook evenly.
Place the chicken pieces, baby potatoes, broccoli florets, and sliced red bell pepper 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 mixture over the chicken and vegetables, then toss thoroughly with your hands or tongs to coat every piece.
Spread the ingredients out into a single layer, ensuring there is space between the items so they roast rather than steam.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the potatoes are fork-tender.
Remove from the oven and let the pan rest for 2 minutes before serving to allow the flavors to meld and the chicken to stay juicy.