Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Slice the cremini mushrooms into halves and trim the woody ends off the asparagus spears.
Mince the garlic cloves and finely chop the fresh thyme and rosemary leaves.
In a small bowl, combine the melted ghee with the minced garlic, thyme, rosemary, sea salt, and black pepper.
Place the chicken breast, mushrooms, and asparagus on the prepared baking sheet.
Drizzle the garlic-herb ghee over the ingredients and toss thoroughly to ensure everything is evenly coated.
Spread the ingredients into a single layer, ensuring the chicken has space around it to brown properly.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the mushrooms are tender.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.