Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Trim the woody ends off the asparagus and dice the sweet potato into small half-inch cubes.
Slice the chicken breast into even one-inch strips to ensure quick and uniform cooking.
In a small bowl, whisk together the olive oil, minced garlic, rosemary, thyme, salt, and pepper.
Place the chicken, sweet potatoes, and asparagus on the baking sheet and drizzle with the herb oil, tossing to coat thoroughly.
Spread the ingredients in a single layer and roast for 18-22 minutes until the chicken is cooked through and the asparagus is tender.
Remove from the oven and drizzle with fresh lemon juice before serving.