Preheat oven to 425 and spray a 9x13 casserole-inch glass baking dish with nonstick cooking spray.
Add ground beef to a medium sized skillet and cook on medium-high heat, breaking up the meat with a spatula as you cook it. Season the meat with salt, pepper, onion powder and garlic powder.
After it is browned and cooked through, drain any excess grease from the skillet, if there is any.
Make your mashed potatoes and gravy according to directions.
Add the gravy to the ground beef and transfer ground beef mixture into a casserole dish.
Spread the vegetables evenly over the top of the ground beef.
Add the mashed potatoes on top of the vegetables. Use a spatula to smooth mashed potatoes evenly over the vegetables.
Top the casserole with the shredded cheese for the final layer.
Bake, uncovered, for 15 mintues until it is bubbly and the cheese is lightly browned.