Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Pat the chicken breast completely dry with a paper towel to ensure the herbs stick and the meat sears beautifully.
In a small bowl, whisk together 1 tablespoon of the extra virgin olive oil, minced garlic, chopped rosemary, sea salt, and black pepper.
Place the chicken breast on one side of the prepared baking sheet and brush thoroughly with half of the herb oil mixture.
Trim the woody ends off the asparagus and place them on the other side of the sheet along with the cherry tomatoes.
Drizzle the remaining 0.5 tablespoon of olive oil and the rest of the herb mixture over the vegetables, tossing to coat evenly.
Thinly slice the half lemon and layer the rounds over the chicken and asparagus spears.
Roast in the center of the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it stays juicy and flavorful.