Preheat your oven to 400°F and line a rimmed baking sheet with parchment paper.
Clean the mushrooms with a damp cloth and slice them in half if they are large.
In a mixing bowl, toss the mushrooms with 0.5 tablespoons of melted ghee, minced garlic, chopped thyme, chopped rosemary, salt, and pepper.
Spread the mushrooms in a single layer on the prepared baking sheet and roast for 18-20 minutes until tender and caramelized.
While mushrooms roast, season the chicken breast with a pinch of salt and pepper.
Heat the remaining 0.5 tablespoons of ghee in a skillet over medium-high heat and sear the chicken for 6-7 minutes per side until the internal temperature reaches 165°F.
Place the baby spinach and warm quinoa on a plate, top with the sliced chicken breast, and finish with the hot roasted garlic butter mushrooms.