Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Slice the sweet potato into 1/4-inch thick rounds and trim the woody ends off the asparagus.
Place the chicken breast, sweet potato rounds, and asparagus on the prepared sheet pan.
In a small bowl, whisk together the olive oil, lemon juice, lemon zest, oregano, garlic powder, sea salt, and black pepper.
Drizzle the herb mixture over the chicken and vegetables, tossing the vegetables and brushing the chicken to ensure everything is evenly coated.
Arrange the ingredients in a single layer, ensuring the chicken has enough space to roast properly.
Roast in the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing and serving.