Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized cubes and halve the baby potatoes so they cook at the same rate.
In a large mixing bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper.
Add the chicken cubes, halved potatoes, broccoli florets, and chopped red bell pepper to the bowl and toss thoroughly until everything is well-coated in the marinade.
Spread the mixture onto the prepared sheet pan in a single even layer, ensuring the ingredients are not crowded to allow for proper roasting.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the potatoes are golden and fork-tender.
Remove from the oven and let rest for 5 minutes before dividing into meal prep containers.