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 in half; cut the chicken breast into 1-inch bite-sized pieces.
In a small mixing bowl, whisk together the melted ghee, extra virgin olive oil, minced garlic, dried thyme, dried rosemary, sea salt, and black pepper.
Place the chicken pieces and mushrooms into a large bowl and pour the garlic butter mixture over them, tossing thoroughly to ensure every piece is well-coated.
Spread the mixture in a single, even layer on the prepared baking sheet, ensuring the chicken and mushrooms 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 browned.
Remove from the oven and garnish with freshly chopped parsley before serving warm.