This mustard and rosemary chicken with mash recipe is a delicious and comforting dish. The chicken is marinated in a tangy mustard and aromatic rosemary mixture, then baked to perfection. The result is tender and flavorful chicken with a crispy golden crust. The creamy mashed potatoes complement the chicken perfectly, creating a satisfying and hearty meal. This recipe is easy to make and is sure to impress your family and friends.