Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Slice the chicken breast into 1-inch bite-sized pieces and chop the red bell pepper into similar-sized squares.
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 pieces, broccoli florets, and bell peppers onto the prepared sheet pan.
Drizzle the lemon-herb oil mixture over the chicken and vegetables, tossing thoroughly with your hands or tongs to ensure everything is evenly coated.
Spread the ingredients out into a single layer, ensuring they aren't overcrowded so they roast rather than steam.
Bake for 18-22 minutes, or until the chicken is cooked through and the vegetables are tender and slightly charred at the edges.
Remove from the oven and serve immediately, perhaps with an extra squeeze of fresh lemon if desired.