Preheat your oven to 400°F (200°C).
Season the chicken breast evenly with half of the sea salt and black pepper.
Heat olive oil in an oven-safe skillet over medium-high heat and sear the chicken for 3 minutes per side until golden brown.
In a small bowl, whisk together the melted ghee, minced garlic, and fresh thyme.
Clean and halve the cremini mushrooms, then toss them in the garlic-ghee mixture until well coated.
Arrange the mushrooms in the skillet around the chicken breast.
Transfer the skillet to the oven and roast for 12-15 minutes until the chicken reaches an internal temperature of 165°F.
While the chicken and mushrooms roast, steam the green beans in a steamer basket for 5-7 minutes until crisp-tender.
Remove the skillet from the oven, garnish with fresh chopped parsley and the remaining salt and pepper, and serve alongside the steamed green beans.