Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Clean the cremini mushrooms with a damp cloth and slice them into halves or quarters depending on their size.
In a small bowl, whisk together the melted ghee, minced garlic, fresh thyme, and fresh rosemary.
Place the mushrooms on the prepared baking sheet and drizzle with the herb-butter mixture, tossing to ensure every piece is well-coated.
Season the chicken breast with olive oil, sea salt, and black pepper, then place it in a hot oven-safe skillet to sear for 3 minutes per side.
Transfer the skillet and the mushroom baking sheet to the oven, roasting for 15-18 minutes until the chicken reaches an internal temperature of 165°F and the mushrooms are tender.
Let the chicken rest for 5 minutes before slicing it into strips.
Serve the sliced chicken alongside the roasted mushrooms, garnishing with a sprinkle of fresh parsley for a bright finish.