Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Clean the cremini mushrooms with a damp cloth and slice them into thick halves or quarters.
Mince the garlic cloves and finely chop the fresh thyme and rosemary.
In a small bowl, melt the ghee and whisk in the minced garlic, thyme, and rosemary.
Place the chicken breast on one side of the baking sheet and season both sides with half of the sea salt and black pepper.
Spread the mushrooms on the other side of the sheet, then drizzle the garlic-herb ghee over both the chicken and the mushrooms.
Toss the mushrooms gently to ensure they are well-coated, then sprinkle the remaining salt and pepper over the entire tray.
Roast in the oven for 18 to 22 minutes, or until the chicken reaches an internal temperature of 165°F and the mushrooms are golden brown.
While the chicken rests for 5 minutes, warm the pre-cooked quinoa.
Slice the chicken into strips and serve alongside the roasted mushrooms over the bed of quinoa, garnishing with fresh parsley.