Preheat your oven to 400°F (200°C).
Season the chicken breast evenly with sea salt, black pepper, and dried oregano.
In a large oven-safe skillet, melt the ghee over medium-high heat.
Sear the chicken for 3 to 4 minutes on each side until a golden crust forms, then remove and set aside.
Add the halved cremini mushrooms to the same skillet, stirring to coat in the remaining ghee and pan juices.
Stir in the minced garlic and sauté for 1 minute until fragrant.
Place the chicken back into the skillet, nestling it among the mushrooms.
Transfer the skillet to the oven and roast for 10 to 12 minutes until the chicken is cooked through.
Finish with a sprinkle of parmesan cheese, fresh parsley, and a squeeze of lemon juice before serving.