Preheat the oven to 375 degrees F.
Cube the beef and mix it with peas, carrots, gravy, dehydrated garlic, and onion.
Spread the beef mixture in the bottom of a 10x10 baking dish.
Top the beef mixture with mashed potatoes and use an offset spatula to smooth them out.
Top the mashed potatoes with shredded cheddar cheese.
Bake for 25-30 mins or until heated through, and serve.
