Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Peel and cube the sweet potato into 1/2-inch pieces and trim the tough, woody ends off the asparagus spears.
Place the chicken breast, cubed sweet potatoes, asparagus, and cherry tomatoes in a single layer on the prepared baking sheet.
In a small glass bowl, whisk together the extra virgin olive oil, lemon juice, minced garlic, and dried rosemary until well combined.
Drizzle the lemon-herb dressing over the chicken and vegetables, using your hands or tongs to toss everything until evenly coated.
Season the entire tray with the sea salt and black pepper.
Roast in the center of the oven for 20 to 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 ensure it stays juicy and flavorful.