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 1-inch bite-sized cubes to ensure even and quick roasting.
Prepare the vegetables by slicing the zucchini into half-moons, chopping the red bell pepper into 1-inch pieces, and trimming the woody ends off the asparagus spears.
In a large mixing bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper.
Add the cubed chicken and all the prepared vegetables to the bowl, tossing thoroughly until every piece is well-coated with the herb marinade.
Spread the chicken and vegetable mixture in a single layer onto the prepared baking sheet, making sure not to overcrowd the pan so the vegetables roast rather than steam.
Place the baking sheet in the oven and roast for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly caramelized edges.
Remove from the oven and serve immediately, optionally garnishing with extra fresh herbs or a final squeeze of lemon juice.