Put cooked ground beef at the bottom of a 9" x 13" pan.
Pour gravy over meat.
Spread out veggies evenly over meat and gravy.
Finally, top with mashed potatoes.
Bake in 350°F oven for 30 minutes.
Broil on low for 3 to 4 minutes until potatoes are browned.
Remove from oven, let shepherd's pie sit for 5 to 10 minutes, then serve.