Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Wash and halve the baby potatoes, then trim the tough, woody ends off the asparagus spears.
Place the chicken breast, halved potatoes, and asparagus on the prepared baking sheet in a single layer.
Drizzle the olive oil over the chicken and vegetables.
In a small bowl, whisk together the garlic powder, onion powder, sea salt, black pepper, and dried thyme.
Sprinkle the seasoning blend evenly over the ingredients on the pan, tossing the vegetables and rubbing the chicken to ensure everything is well-coated.
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 potatoes are fork-tender.
Remove from the oven and immediately drizzle the fresh lemon juice over the chicken and asparagus to brighten the flavors before serving.