Roasted Mustard Potatoes - A thick and creamy mustard dressing works like magic to form a crispy coating over cubed potatoes that is insanely flavorful. The dressing base starts with mustard and also has butter, olive oil, lemon, oregano and parmesan cheese. A wickedly delicious combination. One that brings out the best in potatoes. Crunchy on the outside and soft in the middle.