Transfer casserole to the oven and cook for 1 1/2 hours. Remove from the oven. Add Wattie’s frozen Casserole Mix. Do not stir vegetables into the sauce. Cover. Return to the oven and cook for a further 1 hour until meat is tender. Stir vegetables into the sauce and remove bay leaf. Taste and season with salt and black pepper if necessary. Serve with extra vegetables on the side if wished.