Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized cubes and chop the broccoli and bell peppers into uniform pieces.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken cubes and vegetable pieces onto the prepared sheet pan.
Drizzle the lemon-herb dressing over the chicken and vegetables, tossing thoroughly to ensure every piece is well-coated.
Spread the ingredients out into a single, even layer to ensure they roast properly rather than steaming.
Bake for 18 to 22 minutes, or until the chicken is cooked through and the vegetables have developed slightly charred, golden edges.
Allow the meal to cool slightly before transferring to airtight containers for storage or serving immediately.