leftover mashed potatoes
leftover brown gravy
leftover roast beef

In a medium size baking dish, cover bottom with 1/3 potatoes. Then 1/3 roast beef, then cover with 1/3 gravy. Add cheese of your choice. Repeat until gone. Place in preheated oven at 350°F to 375°F for 15 to 20 minutes or until cheese melts. Serve over toast.