I remember my dad making this casserole (or something similar) when I was a boy, and I've made it myself a number of times for my family. It's a simple recipe that we usually have all the ingredients for, so it's great for end-of-the-week-no-groceries-left-what-can-I-make-for-dinner nights.
Now, I don't usually measure these ingredients--it's a "shoot from the hip" kind of recipe--but I'll give you the basic idea:
2 lbs ground beef
Seasonings to taste
3 cups mashed potatoes
1 10oz can corn, drained
1 1/2 c shredded cheddar
Brown the ground beef and season to taste. I usually go with a subtle Italian flavor since that's what my family likes. A little "Italian Seasoning" mix, some garlic, and a little salt and pepper.
In a large casserole, mix the ground beef and 1 cup of the mashed potatoes. This step makes it easier to scoop out the meat in one piece and not have it crumble. Top with the corn. Sprinkle 1/2 cup of cheese over the corn. Top with mashed potatoes and sprinkle remaining cheese on top.
Bake at 350F for 20 minutes or until the casserole is warmed through and the cheese is melted.