This is really easy if you brown a bunch of ground beef when its on sale and freeze it in smaller packages.
You will need:
1 lb ground beef (turkey or chicken could work too)
1 lb bag mixed veggies
1 envelope instant mashed potatoes
1 jar gravy
Brown your beef.
In the pan you browned your beef in, or a bowl, mix together- beef, veggies, gravy.
Spread potatoes on top, making sure to go all the way to the edges to seal.
Serve with your favorite salad.