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.
Place the chicken, broccoli florets, and bell pepper strips onto the prepared sheet pan.
Drizzle the olive oil over the chicken and vegetables, then sprinkle with sea salt, black pepper, dried oregano, and garlic powder.
Toss everything directly on the pan until evenly coated, then spread into a single layer to ensure even roasting.
Roast in the oven for 18-20 minutes, or until the chicken is cooked through and the vegetables are tender and slightly charred.
Remove from the oven and immediately drizzle with fresh lemon juice and sprinkle with lemon zest for a vibrant finish.