Preheat oven to 350F degrees.

1. Lightly spray a 9×13 inch casserole baking dish with non-stick spray. Set aside.
2. Brown ground beef, drain, set beef aside.
3. Slice the onion, into rounds, then into quarters.
4. Place the mushroom soup in a medium size mixing bowl.
5. Add the milk.
6. Add the salt.
7. Add the pepper.
8. Mix well and set mixture aside.
9. Rinse and slice the potatoes into 1/8 inch thick slices.
10. Place a layer of potatoes in the casserole dish.
11. Add a layer of the beef.
12. Add a layer of onions.
13. Add a layer of soup mixture.
14. Add layer of cheese. Reserve ½ cup of cheese for topping later.
15. Repeat the layering process ending with the soup mixture.
16. Cover with aluminum foil and bake at 350F degrees for 1 hour and 30 minutes.
17. Remove foil, sprinkle top with remaining cheese.
18. Bake uncovered for another 15 minutes or until potatoes are fork tender.
19. Remove from oven, place on wire rack, let cool for 10 minutes.
20. Enjoy!