Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into bite-sized 1-inch cubes and chop the red bell pepper into similar-sized pieces.
Trim the woody ends off the asparagus spears and cut them into 2-inch lengths.
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, bell peppers, and asparagus to the bowl and toss thoroughly until every piece is evenly coated with the herb marinade.
Spread the mixture in a single layer onto the prepared baking sheet, ensuring the pieces are not overcrowded to allow for proper browning.
Roast for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender-crisp with slightly charred edges.
Remove from the oven and let rest for 5 minutes before portioning into meal prep containers.