Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Wash and halve the baby potatoes, cut the broccoli into bite-sized florets, and slice the red bell pepper into strips.
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 breast, potatoes, broccoli, and peppers onto the prepared sheet pan.
Drizzle the lemon-herb oil over the chicken and vegetables, using your hands or a brush to ensure everything is evenly coated.
Arrange the ingredients in a single layer, ensuring the chicken is not covered by the vegetables so it browns properly.
Roast for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender and golden.
Remove from the oven and let the chicken rest for 5 minutes before slicing and serving.