Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Clean the cremini mushrooms with a damp cloth and slice them into halves or quarters so they are uniform in size.
Place the chicken breast and the mushrooms onto the prepared baking sheet, ensuring they are spread out in a single layer.
In a small glass bowl, whisk together the melted ghee, minced garlic, chopped thyme, and chopped rosemary.
Drizzle the garlic-herb ghee over the chicken and mushrooms, tossing the mushrooms gently to ensure they are fully coated.
Season the entire tray evenly with sea salt and freshly cracked black pepper.
Roast for 20 to 25 minutes, or until the chicken is cooked through and the mushrooms are golden brown and tender.
Remove from the oven and drizzle the fresh lemon juice over the dish to brighten the flavors before serving.