Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Trim the woody ends off the asparagus and slice the red bell pepper into thin strips.
Cut the chicken breast into even 1-inch strips to ensure they cook at the same rate as the vegetables.
In a small mixing bowl, whisk together the extra virgin olive oil, fresh lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken, asparagus, and bell peppers onto the prepared sheet pan.
Drizzle the lemon-herb oil over the ingredients and toss thoroughly with your hands or tongs to ensure every piece is well-coated.
Spread the mixture out into a single layer, making sure not to overcrowd the pan so the vegetables roast rather than steam.
Bake for 18 to 22 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender-crisp.
Remove from the oven and garnish with finely chopped fresh parsley before serving hot.