Cottage pie is one of the classic dishes in a british kitchen. It is known for being a hearty, satisfying, and warming food, and although often thought of as a winter dish, it is perfect any time of year. A filling of ground beef, onion, carrot, and garlic is topped with creamy mashed potatoes and shredded cheese to make a fluffy topping with a crispy finish. This recipe is a great use for leftover mashed potatoes, and if you have any extra sunday roast, feel free to replace the ground beef.