Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Wash and prep the produce: cut the sweet potato into 1/2-inch cubes, slice the zucchini into half-moons, and trim the woody ends off the asparagus.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper to create the marinade.
Place the chicken breast on one side of the baking sheet and arrange the sweet potatoes, zucchini, and asparagus on the other side.
Brush half of the lemon-herb marinade over the chicken breast and drizzle the remaining half over the vegetables, tossing the veggies gently to ensure they are evenly coated.
Roast in the center of the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are fork-tender.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.