Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Pat the chicken breast dry with paper towels and season both sides evenly with sea salt and black pepper.
In a small bowl, whisk together the melted ghee, minced garlic, and lemon juice until well combined.
Place the chicken breast, halved cremini mushrooms, and trimmed asparagus onto the prepared baking sheet.
Drizzle the garlic-ghee mixture over the chicken and vegetables, tossing the mushrooms and asparagus to ensure they are thoroughly coated.
Arrange the ingredients in a single layer, ensuring the chicken has enough space to roast evenly.
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 mushrooms are golden and tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing.
Garnish the entire dish with freshly chopped parsley and serve immediately.