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 bite-sized cubes and halve the baby potatoes to ensure even cooking.
Chop the broccoli into small florets and slice the red bell pepper into thin strips.
In a large mixing bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Add the chicken, potatoes, broccoli, and peppers to the bowl and toss thoroughly until every piece is coated in the herb marinade.
Spread the mixture in a single, even layer across the prepared sheet pan, making sure not to overcrowd the ingredients.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the potatoes are fork-tender.
Remove from the oven and garnish with freshly chopped parsley before serving or packing into meal prep containers.