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 into halves or quarters depending on their size.
Cut the chicken breast into bite-sized 1-inch cubes to ensure even cooking.
In a small bowl, melt the ghee and whisk in the minced garlic, smoked paprika, sea salt, and black pepper.
Place the chicken and mushrooms in a large mixing bowl and pour the garlic-ghee mixture over them, tossing thoroughly until every piece is well coated.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring no pieces are overlapping.
Roast in the oven for 18 to 20 minutes, or until the chicken reaches an internal temperature of 165°F and the mushrooms are golden and tender.
Remove from the oven and garnish with freshly chopped parsley before serving hot.