Easy Shepherd's Pie with Leftover Pot Roast

0 Preheat the oven to 375°.
1 Grease a baking dish and add the leftover cooked beef in an even layer.
2 Cover with a layer of the carrots, then the green beans.
3 Set aside.
4 Mix the soup, envelope of onion soup mix, and milk until smooth.
5 Spoon over the beef and vegetables.
6 Gently move the beef and vegetables around with a spoon to help the gravy mixture cover them.
7 Spoon the mashed potatoes over the top.
8 Sprinkle with the Cheddar cheese.
9 Bake for [timer minutes=0]30 to 40 minutes[/timer] or until the cheese is bubbly and the dish is heated all the way through.