Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and slice the red bell pepper into thin strips.
In a small bowl, whisk together the olive oil, lemon juice, lemon zest, oregano, thyme, garlic powder, sea salt, and black pepper.
Place the chicken pieces, broccoli florets, and bell pepper strips onto the prepared sheet pan.
Drizzle the lemon-herb marinade over the chicken and vegetables, tossing thoroughly with your hands or tongs to ensure every piece is evenly coated.
Spread the mixture out into a single layer, ensuring the chicken pieces aren't touching to allow for maximum crispness.
Bake for 20 to 25 minutes, or until the chicken is cooked through to an internal temperature of 165°F and the vegetables are tender-crisp with slightly charred edges.
Remove from the oven and let rest for 2 minutes before serving hot.