Preheat your oven to 425°F (220°C) and line a large rimmed baking sheet with parchment paper.
Pat the chicken breast completely dry with a paper towel to ensure a crispy exterior once roasted.
In a small glass bowl, whisk together the olive oil, lemon juice, minced garlic, dried oregano, sea salt, and black pepper.
Place the chicken breast, broccoli florets, and sliced red bell peppers onto the prepared baking sheet.
Drizzle the lemon-herb oil mixture over the chicken and vegetables, tossing the produce well to ensure every piece is evenly coated.
Arrange the ingredients in a single layer, ensuring the chicken has space around it for the heat to circulate.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables have developed slightly charred edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing to lock in the juices.