Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Wash and slice the cremini mushrooms, and trim the woody ends off the asparagus spears.
Cut the chicken breast into even, bite-sized pieces to ensure uniform cooking.
In a small bowl, melt the ghee and whisk in the minced garlic, dried thyme, sea salt, and black pepper.
Place the chicken, mushrooms, and asparagus in a large mixing bowl and pour the garlic-ghee mixture over them, tossing until every piece is thoroughly coated.
Spread the mixture in a single, even layer on the prepared baking sheet, ensuring the pieces aren't too crowded.
Roast for 18-20 minutes, or until the chicken is cooked through and the mushrooms are tender and golden brown.
Remove from the oven and garnish with freshly chopped parsley before serving warm.