Preheat your oven to 400 degrees Fahrenheit and line a large sheet pan with parchment paper for easy cleanup.
Dice the chicken breast into 1-inch bite-sized pieces and halve the baby potatoes to ensure even cooking.
Place the chicken, potatoes, broccoli florets, and sliced bell peppers on the prepared sheet pan.
In a small 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, tossing thoroughly until everything is well-coated.
Spread the ingredients out in a single layer, ensuring they are not overcrowded so they roast rather than steam.
Bake for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165 degrees Fahrenheit and the potatoes are fork-tender.
Remove from the oven and serve immediately, optionally garnishing with fresh parsley or extra lemon wedges.