Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Slice the sweet potato into 1/2-inch thick wedges and trim the tough, woody ends off the asparagus spears.
In a small ramekin, whisk together the extra virgin olive oil, lemon zest, lemon juice, rosemary, thyme, garlic powder, sea salt, and black pepper.
Place the chicken breast on one side of the prepared baking sheet and the sweet potato wedges on the other side.
Brush the chicken and the sweet potatoes with two-thirds of the lemon-herb oil mixture, ensuring the potatoes are evenly coated for maximum crispness.
Roast in the center of the oven for 15 minutes, then briefly remove the pan to add the asparagus to the middle section.
Drizzle the remaining herb oil over the asparagus and return the pan to the oven for another 10-12 minutes.
Check that the chicken has reached an internal temperature of 165°F and the sweet potatoes are fork-tender and golden brown.
Let the chicken rest for 5 minutes before slicing against the grain to maintain juiciness, then serve alongside the roasted vegetables.