Chicken breast in mushroom sauce

Return the chicken breasts to the pan, spooning the sauce over them. Simmer for an additional 5 minutes to reheat the chicken and allow it to absorb some of the sauce.
Add butter and stir until melted, creating a silky finish to the sauce.
Sprinkle fresh parsley over the dish before serving.
Serve hot, with the mushroom sauce generously spooned over the chicken.