Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Pat the chicken breast dry with paper towels and season both sides evenly with sea salt and black pepper.
Clean the mushrooms with a damp cloth and slice them in half, then finely mince the garlic cloves and chop the fresh herbs.
In a small microwave-safe bowl, melt the ghee and whisk in the minced garlic and fresh thyme until well combined.
Place the chicken breast and the halved mushrooms onto the prepared baking sheet in a single layer.
Drizzle the garlic-ghee mixture over the chicken and mushrooms, tossing the mushrooms gently to ensure they are fully coated.
Roast in the center of the oven for 18 to 22 minutes, or until the chicken reaches an internal temperature of 165°F and the mushrooms are golden brown.
Remove from the oven, drizzle the fresh lemon juice over the dish, and garnish with chopped parsley before serving hot.