Have you been craving cozy comfort food lately? We certainly have, especially on cool rainy days. We used leftover mashed potatoes to make our Shepherd's pie in one pan. Brown the meat, sautée the veggies, top it with fluffy mashed potatoes, and then send the pan straight into the oven until the top was golden brown. It's a great way to use leftovers. Do you have leftover steak? Then chop it up and use that instead of ground beef.