Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Slice the chicken breast into even 1-inch strips to ensure they cook at the same rate as the vegetables.
In a large mixing bowl, whisk together the olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Add the chicken strips, broccoli florets, bell pepper strips, and zucchini slices to the bowl.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the herb marinade.
Spread the mixture in a single layer on the prepared baking sheet, ensuring nothing is overcrowded.
Roast for 18 to 22 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender with slightly charred edges.