Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Slice the baby potatoes into halves and place them on one side of the baking sheet, tossing with 0.5 tbsp of olive oil and a pinch of sea salt.
Roast the potatoes for 12 minutes to ensure they become perfectly tender and golden.
While potatoes roast, pat the chicken breast dry with a paper towel and season both sides evenly with dried thyme, garlic powder, sea salt, and black pepper.
Remove the pan from the oven, push the potatoes to one side, and add the chicken breast and trimmed asparagus spears to the empty space.
Drizzle the remaining 0.5 tbsp of olive oil over the chicken and asparagus, ensuring everything is lightly coated.
Return the pan to the oven and roast for 15-18 minutes, or until the chicken reaches an internal temperature of 165°F and the asparagus is vibrant.
Finish by squeezing the juice from the fresh lemon over the chicken and vegetables before serving immediately.