Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Cut the chicken breast into bite-sized 1-inch cubes and halve the cremini mushrooms.
In a large mixing bowl, whisk together the melted ghee, minced garlic, chopped thyme, chopped rosemary, sea salt, and black pepper.
Add the chicken cubes and mushroom halves to the bowl, tossing thoroughly until every piece is coated in the garlic-herb mixture.
Spread the chicken and mushrooms in a single layer on the prepared baking sheet, ensuring they are not overcrowded.
Roast in the center of the oven for 18 to 20 minutes, or until the chicken is cooked through and the mushrooms are tender and golden.
Remove from the oven, drizzle with fresh lemon juice, and serve immediately over the warm cooked quinoa.